旧机器的许多零件都被重复使用，只有不能使用的零件被扔掉。
Many parts of the old machines are reused, and only the parts that can't be used are thrown away.
明确和重复使用一个收件夹和文件，或者用其他方式来处理每天放在里面的每一件事。
Clear out this inbox and file, recycle, or otherwise process everything in it every day.
该法成本低，被覆剂可重复使用，对于单件或小批量工件的表面强化极为方便。
The cost of this process is low, and the coated agent can be used repeatedly. Also it is convenient for the surface strengthening of single workpiece or small batch of workpieces.
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