按下该组合键之后，将搜索各个不同的位置(由“complete”选项指定)，查找与光标之前的字符开头的任何单词。
When you do, it searches various locations (as specified by the "complete" option), looking for words that start with whatever sequence of characters immediately precedes the cursor.
如果控制键被找到，并且在%keys散列中指定了下一个按下的键，那么该键的事件时间将被记录下来。
If a control key is found, and the next key pressed is specified in the % keys hash, the event time for that key is recorded.
指定瞄准最低点。本例子中直接按下确认键，系统将默认为。
Specify the aiming nadir. For the example accept the default of -y by pressing Enter.
指定瞄准最低点。本例子中直接按下确认键，系统将默认为。
Specify the aiming nadir. For the example accept the default of -y by pressing Enter.
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