annual weed的用法和樣例：
例句
- It is non-selective, which means it kills a wide range of annual grasses and broad-leaved weeds and the tops of established perennial weeds.
具有非選擇性，意味著可以根除多數的一年生雜草和寬葉種子並保持長效作用。 - Any of several annual weeds of the genus Xanthium in the composite family,having small seedlike fruits enclosed within a prickly bur that clings readily to clothing or animal fur.
蒼耳，一種菊科蒼耳屬的一年生雜草，有包在多刺的刺果內的種子樣小果實，其刺果易於粘到衣服或動物皮毛上。
