weir
n.（名词）
A fence or wattle placed in a stream to catch or retain fish.
鱼梁：在河流中用来捕获或拦截鱼的栅栏或枝条篱
A dam placed across a river or canal to raise or divert the water, as for a millrace, or to regulate or measure the flow.
堰，拦河坝，挡流坝：横截河流或运河以提高水位或使河水转向的坝， 如用于推动水车，调节或测量水流
来源：
Middle English were
中古英语 were
from Old English wer * see wer- 4
源自 古英语 wer *参见 wer- 4
