pay a visit to (someone)
拜访
-
he's planning to call on Katherine today .他打算今天拜访凯瑟琳。
) have recourse to
求援,求助
-
we are able to call on academic staff with a wide variety of expertise .我们可向有广博专业知识的学者求助。
[with infinitive]demand that (someone) do something
要求
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he called on the government to hold a plebiscite .他要求政府举行公民投票。