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。
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。
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。
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