原文已被隐藏，你可用 快捷键 - 或点击 显示原文 按钮来查看原文
第1段
1 .This is Scientific American's 60-Second Science. I'm Karen Hopkin. This'll just take a minute.
该句暂无译文！
2 .Hybrid cars are good for the environment.
该句暂无译文！
3 .But scientists say that they might be bad for pedestrians.
该句暂无译文！
4 .Because hybrids are so quiet, it can be hard for walkers to hear them until it's too late.
该句暂无译文！
5 .Listen to this.
该句暂无译文！
6 .(quiet car sound)
该句暂无译文！
7 .That's a Toyota Prius moving at five miles an hour.
该句暂无译文！
8 .If you didn't hear anything, well, that's what worries scientists at the University of California, Riverside.
该句暂无译文！
9 .They recorded the sounds made by an approaching hybrid vehicle and by a car with a standard, internal combustion engine.
该句暂无译文！
10 .They then asked listeners wearing headphones to determine whether the car was coming from the left or the right.
该句暂无译文！
11 .Turns out people could hear the standard vehicle from about 36 feet away.
该句暂无译文！
12 .But the hybrid was able to sneak up to just 11 feet away before listeners knew where it was coming from.
该句暂无译文！
13 .And when the scientists added some background noise, people couldn't pinpoint the direction of the Prius until it had already passed them by,
该句暂无译文！
14 .results they'll be presenting at the May meeting of the Acoustical Society of America in Portland, Oregon.
该句暂无译文！
15 .The solution, they say, is to require a "minimum sound" for all late model cars.
该句暂无译文！
16 .No annoying beeps or alarms.
该句暂无译文！
17 .Just something to supply that new-car sound.
该句暂无译文！
18 .Thanks for the minute, for Scientific American 60-Second Science. I'm Karen Hopkin.
该句暂无译文！