请回电话的英文：
to call back

call是什么意思：
v. 把...叫做；认为...是；打电话叫；大声呼叫；召唤；打电话；访问
n. 打电话；通话；短暂拜访；请求；呼吁；召唤；呼唤

call upon; call on
应用;访问;号召;呼吁

This is called wow.
这叫作“音幅失真”。

It was called the Restoration.
这就是所谓的王政复辟。

A call to WSALookupServiceEnd was made while this call was still processing. The call has been canceled.
在该调用还处于处理中时，就调用了WSALookupServiceEnd。该调用被取消。

Friends are lost by calling often and calling seldom
交往过密过疏,都会失去朋友

back是什么意思：
n. 后面，背面，反面；背，背部；靠背；后卫
v. 支持；后退，倒退；背书；下赌注于
adj. 背部的；后面的；过去的；拖欠的.
adv. 以前；向后地；来回地；上溯

Stand back to back!
背靠背站好！

They are on the back of the menu.
它们在菜单背面。

Our seats on the train were back to back.
我们在火车上的坐位是背靠背的。

It happened far back in the past.
这事发生在久远的过去。

the back of a Chinese robe or jacket
后襟