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重点讲解：
1. open fire 开枪；开火；
The gunmen opened fire on the police.
持枪歹徒向警察开火。
2. rule out 开枪；开火；
Local detectives have ruled out foul play.
当地的侦探已经排除了他杀的可能性。
3. come into force (法律、规定或体系)实施，生效；
The first price increases are due to come into force in July.
第一批提价预计将在7月开始执行。
4. no longer 不再；已不；
There is a real danger that some people will no longer be able to afford insurance.
一些人很可能再也负担不起保险了。
n. 雇员
