The occurrence of the lower limit of bed material size is attributed to the grain size composition of incoming sediment and the fining mechanism.

研究认为河床质调整极限是由来沙组成及河床质细化机制决定的。

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While selecting the bed , the key elements that should be kept in mind are comfort, support, size and material.

在选择床上，关键要素，应当铭记的是安慰，支持，尺寸和材料。

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In the choose and buy a baby bed, many parents more pay attention to environmental protection, material qualitative, accessories, and other aspects, but often ignore size this problem.

在选购婴儿床时，很多家长会比较注重环保、材质、配件等方面，但却往往会忽视尺寸这个问题。

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