For each messages 4 extra bytes are needed to store the message length information.
对于每个消息，需要4个额外的字节来保存消息的长度信息。
More data are needed, however, with regard to the length of time.
然而，考虑到时间问题，需要更多的数据来证明。
This method is practical because the original length of individual bolt is not needed.
该方法无需预知螺栓的初始长度，更为实用。
This method is practical because the original length of individual bolt is not needed.
该方法无需预知螺栓的初始长度，更为实用。
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