Thanks to a number of mechanical checks and balances, brake failure rarely occurs.

多亏了一系列的机械制衡，制动失效才很少发生。

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Boeing said the plane could make its maiden flight from Paine Field, north of Seattle, as early as 10 a. m. Monday, depending on the weather and last-minute mechanical checks.

波音公司称该机最早可于周一早上10点从西雅图北边的佩恩机场起飞开始进行首航，但还需视天气及最终机械检查而定。

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If installed on a fire sprinkler system, all mechanical checks, such as alarm checks and backflow preventers, should be flow tested and inspected internally in accordance with NFPA 13 and NFPA 25.

如果安装在防火喷淋系统上，所有机械式止回阀，如警告止回阀和防回流阀，都应该根据美国国家消防协会NFPA 13和NFPA 25标准进行流量测试和内部检查。

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The "professional diligence" test under the CPRs mean that buyers can reasonably expect traders to carry out pre-sale checks in relation to the history, mileage and mechanical condition of the car.

BBC: Q&A: Buying a used car