Call waiting
01
呼叫等待, 等待呼叫通知
a phone service that enables one to know or answer an incoming call during another call
例子
I was talking to my friend when call waiting notified me of another incoming call.
我正在和朋友说话时，呼叫等待通知我有另一个来电。
She had to put me on hold because of call waiting, but then she came back to finish our conversation.
由于呼叫等待，她不得不把我搁置，但后来她回来完成了我们的谈话。
