紫蝴蝶CYF
He has stayed in Beijing for two years. 现在完成时,表示过去延续到现在的一种状态. 如果他现在已不在北京,只是以前在北京住过,要用一般过去时,即：He lived in Beijing for two years.
姣姣Devil
他在北京转机He transfered to flight at BeijingHis connecting flight is at BeijingHe changed planes at Beijing
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