After using that burner, the boiler safety, economic and long period operation were secured further.
改用该燃烧器后，进一步保证了锅炉安全、经济和长周期运行。
Residents heard an enormous bang as a safety valve on the boiler failed.
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.
当锅炉的一个安全阀失灵时，居民们听到了一声巨响。
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