They are employed by machinery, equipment, motor vehicle, automotive parts, aircraft and other metal products manufacturing companies and by machine shops.

他们受雇于机械，设备，汽车，汽车零部件，飞机及其他金属制品制造企业和机器加工车间。

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Permission for an aircraft, ship, or other vehicle to proceed, as after an inspection of equipment or cargo or during certain traffic conditions.

结关，准许通行：让飞机、轮船或其它交通运输工具继续前进的许可，如经过对设备和货物的检查或在特定的交通状况下。

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Other contributing factors may include vehicle exhaust, air-conditioners, and street equipment.

其他促成因素还可能包括汽车尾气、空调和街道设备。

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Cameras are now appearing on roads in other countries, with some vehicle hire companies in the United Kingdom offering them as standard equipment, and hauliers to ensure the safety of their drivers.

BBC: Meteor highlights rise of dashboard cameras in Russia