What is a reliefwell, how does it work, and when will it be completed?
减压井是什么?它的工作原理如何?什么时候才能完工?
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BP resumed work on a reliefwell that will permanently end the risk of further oil escaping, Wells said.
BP恢复了减压井的作业,它能永久的结束未来原油泄漏的危险,威尔斯说。
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The flow will stop only once a reliefwell is dug; the first of these will not be completed before mid-August and, of course, more than one may be needed.