段落1
This is Scientific American 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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Why did the tiny nematode worm cross the road?
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Well, for all the usual reasons.
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But a more interesting question is "how did it make the crossing?"
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Turns out, it may have hitched a ride, inside a slug, or other invertebrate.
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That's according to a study in the journal BMC Ecology.
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Nematodes are about a millimeter long.
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They're often found on decomposing fruits or rotting plants, where they feast on the resident bacteria.
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But when that food source is exhausted, how do these diminutive diners make their way to their next meal, which could be in a mulch pile a major trek of several yards away?
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To find out, researchers hit the compost heap, and they collected some 600 slugs and 400 centipedes, spiders, beetles, flies and locusts.
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And they found that the innards of slugs, centipedes and woodlice are littered with live worms that the larger creepy crawlies accidentally ingested as they snacked.
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But what becomes of these itinerant intestinal interlopers?
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To solve that mystery, the researchers exposed 79 slugs to more than a million nematodes that had been tagged with a fluorescent marker.
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And they saw that the worms not only survive a southbound trip through a slug's guts, they emerge none the worse for where-they've-been when their ride takes a bathroom break.
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Sure, a chugging slug isn't exactly high-speed rail.
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But its bacteria-filled belly means that, for the nematode passengers, the dining car is always open.
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Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.
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1 / 17
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显示原文 =This is Scientific American 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
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2 / 17
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显示原文 =Why did the tiny nematode worm cross the road?
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3 / 17
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显示原文 =Well, for all the usual reasons.
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4 / 17
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显示原文 =But a more interesting question is "how did it make the crossing?"
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5 / 17
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显示原文 =Turns out, it may have hitched a ride, inside a slug, or other invertebrate.
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6 / 17
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显示原文 =That's according to a study in the journal BMC Ecology.
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7 / 17
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显示原文 =Nematodes are about a millimeter long.
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8 / 17
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显示原文 =They're often found on decomposing fruits or rotting plants, where they feast on the resident bacteria.
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9 / 17
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显示原文 =But when that food source is exhausted, how do these diminutive diners make their way to their next meal, which could be in a mulch pile a major trek of several yards away?
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10 / 17
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显示原文 =To find out, researchers hit the compost heap, and they collected some 600 slugs and 400 centipedes, spiders, beetles, flies and locusts.
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11 / 17
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显示原文 =And they found that the innards of slugs, centipedes and woodlice are littered with live worms that the larger creepy crawlies accidentally ingested as they snacked.
点击显示原文 = -
12 / 17
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显示原文 =But what becomes of these itinerant intestinal interlopers?
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13 / 17
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显示原文 =To solve that mystery, the researchers exposed 79 slugs to more than a million nematodes that had been tagged with a fluorescent marker.
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14 / 17
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显示原文 =And they saw that the worms not only survive a southbound trip through a slug's guts, they emerge none the worse for where-they've-been when their ride takes a bathroom break.
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15 / 17
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显示原文 =Sure, a chugging slug isn't exactly high-speed rail.
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16 / 17
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显示原文 =But its bacteria-filled belly means that, for the nematode passengers, the dining car is always open.
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17 / 17
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显示原文 =Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.
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- 单句循环：关
- 单句循环：×3
- 单句循环：×5
- 单句循环：∞