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The failure of collar connection thread is one of the prime drill tool failures.
石油钻铤螺纹联接失效是钻具失效的主要类型。
youdao
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The prime minister was a mere tool in the hands of the country's president.
组织培养是用于病毒试验的最重要的手段。
youdao
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The prime minister was a mere tool in the hands of the country's president.
组织培养是用于病毒试验的最重要的手段。
youdao