The US spends billions of dollars fighting invasive weeds like the pretty but pesky yellow rocket flower that chokes fields and creeps onto golf courses and lawns.

美国花费数十亿美元与入侵杂草作斗争，如一种非常漂亮但很讨厌的黄色香花芥，这些花入侵牧场并向高尔夫球场蔓延。