借助于一些旧零件,他要做一个飞机模型。
他收集了一些收音机的旧零件,然后用它们鼓捣出了一台新的收音机。
He collected some old radio parts and tinkered with them to make a new radio.
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.
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