首先是“载波感测”。以太网站先检查“以太”是否空载，如果检测到信号了就排队等候自己的发送机会。
First of all, Ethernet stations check to see if the ether is idle (carrier sense) and wait if they sense a signal.
在消息解码的过程中，沿着信道的噪声可能干扰接收机对来自发送机的信号的解释，其可以破坏或失真信号。
In the process of message decoding, noise along the channel may interfere with the receiver's interpreting of the signal from the sender it can destroy or distort the signal.
超声波摄像装置具备：从超声波元件阵列将超声波脉冲信号 发送到被检测体的波发送机构；
The ultrasonographic device for imaging inside of an examinee includes: transmission means for transmitting an ultrasonic pulse signal from an ultrasonic element array to the examinee;
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