目的：研究不同软硬度床褥对睡眠质量的影响。

Objective: To investigate the various effects of the mattresses with different firmness on sleep quality.

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产品形状、颜色、软硬度可以根据客户需要改变。

Can be made in unique shapes, colours and softness according to customer requirements.

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酸碱软硬度的定量标度是软硬酸碱原则研究中有待解决的重要课题。

The quantitative scale of the hardness-softness of acids and bases is an important problem yet to be solved in the study of the principles of hard and soft acids and bases.

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