Traditional Traditional tools such as axes, shovels and spades are used to open rectangular pools 50cm deep and extract the salt crystals.
传统工具像轴线，铁铲用来挖出50厘米深的矩形水槽，从中取出盐晶体。
Construct a set of rectangular axes and resolve any inclined forces into rectangular components.
作一组直角坐标轴，把各力都分解成正交分量。
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