| 单词 | emergency valve |
| 例句 | DEFINITIVE EXAMPLES 权威例句On-shore oil fields are often built with emergency valves below ground level, to shut off the supply if a well gets out of control.陆上油田常常在地面以下建造紧急活门，在油井失控的情况下用以关闭供油管道。剑桥国际 |
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