call on

• 短语动词，用于表示短暂拜访某人，或指正式请求或要求某人做某事，尤指在课堂上或正式场合。

A phrasal verb used to indicate visiting someone briefly, or to formally ask or request someone to do something, especially in a classroom or formal setting.

不可数 · 不及物 · 短语动词，不可分

1. Visit someoneformal

   To pay a short visit to someone, usually at their home.

   拜访

   • We called on our grandmother yesterday.
   • He called on his friend while he was in town.
   • They called on the neighbors to welcome them.

   同义词come bydrop bylook uppop inseevisit

2. Ask for help or supportformal

   To request someone to do something, especially to speak or contribute.

   呼吁

   • The teacher called on the student to answer the question.
   • She called on the government to take action.
   • He called on his colleagues for assistance.

   同义词askenlistinvokerequestsolicitsummonturn to

3. Appeal or invokeformal

   To make a formal request or appeal to someone or something.

   呼吁

   • The charity called on the public to donate money.
   • They called on the authorities to investigate the incident.
   • The president called on the nation to remain calm.

   同义词beseechentreatimploreinvokepetitionsolicitsupplicate

基本动词call