I would like a hard sleeper, please. Middle bed if possible.
我想买一张硬卧的票，如果可以的话我想要中铺。
The rail acoustic radiation efficiency has little difference whether the force is on the sleeper or in the middle of the sleeper.
力作用在轨枕中间与轨枕上方时，声辐射效率差别极小。
The rail acoustic radiation efficiency has little difference whether the force is on the sleeper or in the middle of the sleeper.
力作用在轨枕中间与轨枕上方时，声辐射效率差别极小。
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