I called on the doctor yesterday.

　　我昨天去拜訪了醫(yī)生。

　　I called at the doctor's yesterday.

　　我昨天去了醫(yī)務(wù)室。

　　He was called up at the beginning of the war.

　　戰(zhàn)爭(zhēng)開始時(shí)他就被征召入伍了。

　　He called on the workers to fight for their rights.

　　他號(hào)召工人為爭(zhēng)取自己的權(quán)利而斗爭(zhēng)。

　　I'd like to call on you this Sunday.

　　我想這個(gè)星期天來找你。