当两个或多个数据站想在同一时间通过共享信道发送数据，或两个数据站想在同一时间在双向交替通信中发送数据时产生的一种状态。 A condition arising when two or more data stations attempt to transmit at the same time over a shared channel, or when two data stations attempt to transmit at the same time in two-way alternate communication.
他似乎正在发送信号。 He seems to be signalling.
由终端操作员或计算机发送的字符或其它的短报文，用以指出已经收到前一报文。 By a terminal operator or computer; to send a character or other message to indicate that the previous message has been received.
发送或接收一幅新的快照会覆盖前面的图象。 Send or receiving a new snapshot overwrite the previous image.
你的职责是检查和发送邮件。 Your duties include checking the post and distributing it.
