rapier
['reipjə]
n.轻巧而细长的剑
adj.机智的
例句与用法：
The boat shot the rapids.
那条船穿过急流。
A deep, round hole worn in rock by loose stones whirling in strong rapids or waterfalls.
锅穴，壶穴岩石上深深的圆洞，由于急流或瀑布的水涡带动疏松的石块旋转而成
They fell into the seething waters of the rapids.
他们跌进了汹涌的急流中。
详细释义：
n.
一种细长的剑