a line that gradually bends like part of a circle

曲线，弧线:

the curve of her hips

她的臀部曲线

a sweeping curve of railroad track

铁轨的大弧线

a line on a graph that gradually bends and represents a change in the amount or level of something

〔图表上表示变化的〕曲线:

The curve illustrates costs per capita.

这条曲线显示人均费用。

The market demand curve has increased.

市场需求曲线上升了。

a bend in a road, river etc

〔道路、河流等的〕弯曲处:

The car took the curve much too quickly.

那辆汽车拐弯太快了。

also curve ball in baseball, a ball that spins and moves in a curve when it is thrown, so that it is difficult to hit

〔棒球的〕曲线球

throw sb a curve, [AmE] to surprise someone with a question or problem that is difficult to deal with

〔提出问题〕难倒某人; 抛给某人一个难题

to bend or move in the shape of a curve, or to make something do this

弄弯，（使）弯曲:

The track curved round the side of the hill.

小路弯弯曲曲，依山而行。

A smile curved her lips.

她咧嘴笑了。