1 PHRASAL VERB （从做…）改变（为做…） If you change over from one thing to another, you stop doing one thing and start doing the other. （从做…）改变（为做…）
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We are gradually changing over to a completely metric system. [V P + from/to]
我们正逐渐过渡到完全使用公制。
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The two men swapped places, always extinguishing the light when they changed over. [VERB PREP.]
那两名男子几次互调位置，并且每次交换时都会先灭了灯。