... at a time：每次，一次 attach to：属于，归因于 attach oneself to：参加，加入 ...
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... attach to使属于，使参加；认为有（责任等） attach oneself to依附；参加党派 be attached to（变得）喜欢，依恋，对……有感情 ...
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attach oneself to an expedition 参加探险队
to attach oneself to 依附
Attach Oneself To Others 依草附木
Attach Oneself To The Party 入党
participate , mix , adhere
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