Different classes of boats are of different length, width, weight, and even their sails are of different areas.

不同级别的船只有不同的长度、宽度、重量，甚至船帆的面积也不相同。

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There were significant differences in ratios of fibre length to width of plantations, with different densities, as well as in basic densities of different elevation gradient and of tree classes.

不同林分密度人工林纤维长宽比差异显著；不同海拔梯度人工林及不同林木等级间基本密度差异显著。

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