verb · to carry out, put into effect, or fulfill (a policy, plan, or measure)

政府必须认真落实各项安全措施。

verb · to decide on, settle, or make sure of something; to verify

关于明天会议的参加人数已经落实了。

verb · workable, realistic, or down-to-earth

这个方案制订得不够落实，需要进一步修改。