call at:停靠;(短暂)停留
比如:This train calls at Pingyao and Hongtong.火车在平遥和洪洞停车。
call on
1.邀请 比如:I now call on the chairman to address the meeting.现在请主席向大会致辞。
2.请求,要求 比如:Allies will increasingly call upon the US for assistance as they warily eye ascendant neighbours .在警惕注视邻国崛起之际,同盟国会越来越多地呼吁美国施以援手。
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