被动磁力轴承造价低廉，但是不可控。
承造学校新建筑的人又将工程转包给铅管工人，汽管装配工人等等。
The contractor for the new school building gave out subcontracts to a plumber a steam fitter etc.
大连造船厂承造的某型船舶由于其动力系统结构复杂，设备及管路舾装周期很长。
A certain type of ship built by Dalian Shipyard due to its complicated structure of propulsion system the fitting-out cycle of the equipment and piping is very long.
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