Some drugs killoff useful bacteria in the user's body.
某些药物会杀死服用者体内的有益细菌。
《牛津词典》
2
The prophets of doom who said television would killoff the book were wrong.
认为电视会扼杀书籍的悲观预言家完全错了。
《牛津词典》
3
The more diligent we are, the more likely we are to accumulate experience, master skills, discover and killoff our shortcomings and create more opportunities.