call on 号召；拜访 He called on the workers to fight for their rights. 他号召工人为争取自己的权利而斗争。 I'd like to call on you this Sunday. 我想这个星期天来找你。 I'm going to call on one of my former classmates. 我要去看望我的一位老同学。 You'd better call on your friends to help you. 你最好请朋友来帮你。
