Expanding gases can be used to operate a machine.

膨胀的气体可以用来开动机器。

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The children were given the task of learning to operate a machine so as to get a toy.

儿童被分配学习如何操纵机器以便获取玩具的任务。

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The children were given the task of learning to operate a machine so as to get a toy.

儿童被分配学习如何操纵机器以便获取玩具的任务。

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