Each berth should be fitted with a comfortable mattress with cushioning bottom or a combined cushioning mattress, including a spring bottom or a spring mattress.
每张床铺应配备带有缓冲底板的舒服床垫或包括弹簧底板或弹簧床绷在内的复合缓冲床垫。
The spring structure has the advantages of cushioning property, simple structure, low production cost and suitability for all vehicles.
弹簧结构在具有缓冲能力的同时，结构简单，制造成本低，适用于所有车辆。
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