n.倒钩；刻薄的言语
Surgeons removed a foot-long barb from his heart. 外科医生正从他的心脏移出一英尺长的倒钩。
A fish hook has a barb to prevent the fish from escaping after being hooked. 鱼钩上都有一个倒钩以防上了钩的鱼逃走.
And with that last barb, Harry's slowly unravelling grip on his temper gave way. 他一直听到最后那句挖苦话，结果先前的忍耐终于失去控制了。
