Definition: If a law, rule, etc. is in force, it exists and is being used. Level: C2
限制在这条河上捕鱼的新法规现已生效。
New regulations limiting fishing on this river are now ___in ___force.
如果规则没有被正式颁布，它可能不会生效。
If a rule is not officially enacted, it may not be ___in ___force.
公司关于远程办公的新政策将从一月起生效。
The company's new policy on remote work will be ___in ___force from January.
