当锅炉的一个安全阀失灵时，居民们听到了一声巨响。
Residents heard an enormous bang as a safety valve on the boiler failed.
当钻井下沉时，海底立管在顶部附近破裂，另一端还连在防喷阀上。 在随后的倒塌中，它像脆饼一样弯曲。
When the rig sank, the riser broke near the top while remaining attached to the blowout preventer at the bottom, bending itself like a pretzel in its subsequent collapse.
巴扎尔吉特当初设计了一个安全阀，当管网中的污水太多时，不经处理的污水便直接注入泰晤士河。
Bazalgette's design included a safety valve: when too much waste enters the system, raw sewage runs into the River Thames.
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