The chain drive RIGS are driven by the integral enclosed compound chain box and torque converter. During rig moves, the chains can be dismantled for ease of installation.

链传动钻机采用整体密闭式并车链条箱与变矩器统一驱动形式，在钻机搬家时无需拆装链条，可实现快速安装。

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The wooden box is actually a homemade device for doing polymerase chain reactions (PCR), a process that turns small samples of DNA into quantities large enough to analyze.

那个木箱子实际上就是一台自制的进行聚合酶链反应(PCR)设备。P CR是一个工艺过程，可以将DNA样本增殖到数量足够大，达到可以分析的程度。

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Other elements include the "box-office chain effect", the tourism boost from the star's films and the "general promotional effect" for Britain.

其他因素还包括“票房链效应”，明星电影对旅游业的刺激效果及对英国的“总促进效应”。

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Peterson, founder of the Jack in the Box restaurant chain, from 1977 until his death in 1994, but court documents don't disclose the size of the couple's fortune that apparently funded O'Connor's gambling habit.

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Half its clients need help essentially to squelch a competitor's project--a supermarket chain, say, wants to keep a big box out of town.

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Anderson said in an interview Thursday that the probe had wounded morale at the electronics chain, which is struggling to adapt its big-box business model to new competitive threats from online retailers such as Amazon.com Inc.

WSJ: Best Buy Probe Concerns an Alleged Relationship of CEO Brian Dunn, Use of Assets