减压井是什么？它的工作原理如何？什么时候才能完工？
What is a relief well, how does it work, and when will it be completed?
问题在于柴油机的工作原理是什么，它同汽油机有何区别。
The question is how a diesel engine works and how it differs from a gasoline engine.
问题在于柴油机的工作原理是什么，它同汽油机有何区别。
The question is how a diesel engine works and how it differs from a gasoline engine.
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