总之，运用激光粒度分析土壤机械组成是可行的。
In sum, using laser grain-size analysis in studying soil mechanical composition was feasible.
所有机器都是由一个以上的简单机械组成；我们认为这是很清楚的。
We think it quite obvious that all machines are made up of one or more simple machines.
本文根据230个土壤剖面的机械组成数据绘制了海宁县土壤质地图。
The soil texture chart of Haining County was mapped based on data of mechanical composition of 230 soil profiles.
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