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有介詞,也有副詞 look at/ for/ about是動詞+介詞,如果跟賓語,不管是代詞還是名詞,都放在後面 look up/ through turn on/off/ up/ down是動詞+副詞,如果賓語是名詞,放在後面、中間都可以;如果賓語是代詞,放在動詞和副詞中間
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