Take another example of "simultaneous reception", its appearance is also related with many other factors, such as burglarproof, secret release proof and so on.
又以“接受同步”为例，它的出现也与很多因素有关，比如防盗版、防泄密的需要等。
Telephone: Instrument designed for simultaneous transmission and reception of the human voice.
电话：设计用来同时传送和接收语音的设备。
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