At its most basic level, a roller coaster is a machine that USES gravity to send a train along a winding track.

从最基本的层面来说，过山车是一种利用重力让车体沿着弯曲轨道运行的机器。

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The measures to disturbing the current by means of winding on the conductor surface or application of low-noise conductor can reduce the level of wind noise and corona noise.

在导线表面采取缠绕扰流线措施或直接使用低噪声导线，能够降低导线风噪声和电晕噪声水平。

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Directing to the problem of ac double-drum single rope winding lifter working in multiple level without electric brake in middle level, put forward the reform plan.

针对交流双滚筒单绳缠绕式提升机在多水平运行时，中间水平没有电气制动的问题，提出改造方案。

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