1.

1. 安全线：Safety rules 安全规程 \y ?*} L | Safety valve 安全线 XdDQ$'*X | Sample 取样、举例 ){P`-ZF

2. 安全门：空气预热器 air preheater | 安全门 safety valve | 防暴门 explosion vent

3. 911查询·英语单词

3. 安全泄气阀：Safety relief valve|安全泄压阀 | Safety valve|安全泄气阀 | Sample cooler|取样冷却器

1. 安全阀
    A safety valve is a device which allows liquids or gases to escape from a machine when the pressure inside it becomes too great.

    e.g. Residents heard an enormous bang as a safety valve on the boiler failed.
           由于锅炉的安全阀失效，居民们听到了砰的一声巨响。

2. 发泄口;疏导情绪的办法
    A safety valve is something that allows you to release strong feelings without hurting yourself or others.

safety valve的翻译

    e.g. ...crying is a natural safety valve.
           哭泣是一种发泄情感的自然方式。

1. a valve in a container in which pressure can build up (as a steam boiler)
    it opens automatically when the pressure reaches a dangerous level

    Synonym: relief valveescape valveescape cockescape