Concrete repairs under heavy traffic flow remains a difficult problem in highway maintenance.

在高交通流量下砼的修补是公路养护部门的一大难题。

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Maintains, tests and repairs diesel motors and the mechanical parts of trucks, buses and other heavy vehicles such as transmissions, suspension, steering and brakes.

维护、测试及维修柴油发动机以及卡车、巴士以及其他重型机车的机械零件，诸如变速箱、悬架、转向和刹车等零部件。

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Harbour City said the duck was being deflated for a routine inspection and repairs after exposure to heavy waves in the harbor.

WSJ: In Hong Kong, Giant Duck Makes a Splash

Today, to save money, airlines have outsourced most of their heavy maintenance and repairs to contractors not only in the U.S. but also overseas in China, Mexico, Singapore, El Salvador and elsewhere.

WSJ: Book Review: Attention All Passengers