1 PHRASAL VERB 换台;换频道 If you switch over when you are watching television, you change to another channel. 换台;换频道
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I just happened to switch over although I haven't been watching the Olympics. [VERB PREP.]
我并没有一直在看奥运会，当时只是恰好换到这个频道。
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Let's switch over to Channel 4. [VERB PREP. + to]
换到 4 频道吧。