In this article, a thorough investigation has been conducted into heating rate, holding time and cooling speed in an effort to work out an optimum ingot annealing process.

本文对铸件退火时如何控制加热速度、保温时间、冷却速度进行了充分的研究和探讨，为合理制定铸件退火工艺指出了方向。

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The FBI conducted a thorough investigation and found "no ties to terrorism, " Mueller said.

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We also conducted a thorough investigation and found the allegation of underage conduct to be unsubstantiated.

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The subcommittee conducted a thorough investigation of the allegations, interviewing numerous witnesses and reviewing thousands of documents.

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