call后面加什么介词 打电话

　　I'll call for you at 7 o'clock.

　　我7点钟去接你。

　　A truck driver used his CB radio to call for help.

　　卡车司机用民用波段无线电呼救。

　　The radio station had an open line on which listeners could call up to discuss various issues.

　　这家电台开放线路，听众可打电话参加各种问题的讨论。

　　The magician offered to call up the spirit of any great person of the past that we liked to name.

　　魔术师表示能把任何一个我们愿意指定的死去的伟人的鬼魂召回。

　　When I'm in Pittsburgh, I call him up

　　我每到匹兹堡，都给他打电话。