na. 保险阀；〈比喻〉缓和紧张状态的手段
[网络] 安全筏；阀门；充气式安全阀

safety valves的用法和样例：

例句

The safety valve of his anger opened.他控制怒火的安全阀打开了。
No relief valve is required where two pressure reducing valves are installed.如果装上两个减压阀，就不需要安全阀。

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The school is having a fire safety day. Read, listen and act. Fireman: A fire can happen when you're sleeping at home. When you hear the fire alarm, get up quickly. When you / they ... don't... You should ...

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听一分钟英文-F

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2010年NPR美国国家公共电台7月

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China adopts school bus safety regulation

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China's education ministry reiterates school bus safety

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School bus safety draft regulation released

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学英语单词

1-Xylylazo-2-naphthol

approach and departure controller

argyrin

asiatics

auxiliary ballast tank

auxiliary weapons control