It has no standard way of signalling the start and end of a message.
缺乏标准的方式标识一条消息的开始和结束。
Officials said the most likely reason for the accident was a signalling error.
官方说事故原因很可能是信号错误。
First, it has a signalling function.
首先，它有一个信号的功能。
He pointed to a chair, signalling for her to sit.
他指着一把椅子，示意她坐下。
He pointed to a chair, signalling for her to sit.
他指着一把椅子，示意她坐下。
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