Click on the Length TAB to specify how many row summaries you want to display.
单击length选项卡，指定希望显示多少行摘要。
Options allow you to control the output from wc or to display other information such as maximum line length.
可以使用选项控制wc的输出，或者显示其他信息，比如行的最大长度。
The next section emits the traffic incident string to the display, if it has been received (which you know, because it has a non-zero length).
如果已经接收（您是可以判断的，因为它的长度是大于 0 的）到流量事件字符串，那么下一步就是显示它。
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