✔ 最佳答案
CALL ON
(1) If you call on someone, you pay them a short visit. (拜訪,探望)
Let us call on John on our way home.
(2) If you call on someone to do something, you appeal to them to do it. (呼籲)
The United Nation called on both sides to observe the ceasefire.
(3) If you call on something, you decide use something that someone can offer you. (fairly formal use) (需要)
We may need to call on professional help.
CALL IN
(1) If you call someone in, you ask them to come and help you or do something for you. (請求)
The Government called in police to deal with the disturbance.
(2) If you call in, you contact someone by telephoning them.
打電話(請病假), 邀請聽眾打電話進來
She called in sick.
It’s a hot topic, and people have been calling in all morning.
(3) If someone calls something in, they ask for it to be returned. (收回)
The manufacturer has called in all its defective products.
CALL OFF
(1) If you call off an event or arrangement that has been planned, you cancel it. (取消)
The rescuers called off the search because of bad weather.
She called off the wedding after she found out her boyfriend had cheated on her.
(2) If you call a dog or a person off, you order them to stop attacking someone else. (喊走)
The dog was barking and growling at me until its owner called it off.
CALL AT
(1) If you call at some place, you stop at that place briefly. (到...作短暫逗留)
I called at the pharmacy for some medicine.
(2) If a train, bus, or ship calls at somewhere, it stops there during its journey (停泊)
Our train will call at Guangzhou (Canton) and all stations to Beijing.
參考: Longman Dictionary/Yahoo Dictionary