locust

1. N-COUNT Locusts are large insects, similar to grasshoppers, that live mainly in hot areas and often cause serious damage to crops. 蝗虫

...a swarm of locusts. …一群蝗虫。

2. N-COUNT a North American leguminous tree, Robinia pseudoacacia, having prickly branches, hanging clusters of white fragrant flowers, and reddish-brown seed pods 洋槐树 (Also called locust tree, false acacia)