The first check performed ensures that a key press and key-release event is recorded for a given entry.
执行的第一个检查将确保记录给定输入的按键和释放事件。
As you may recall from the xev testing performed above, an individual key press or key-release event causes four or five lines to be printed by the xev program.
从上面执行的xev测试可以看到，单个按键或释放事件将导致xev程序打印四行或五行输出。
As you may recall from the xev testing performed above, an individual key press or key-release event causes four or five lines to be printed by the xev program.
从上面执行的xev测试可以看到，单个按键或释放事件将导致xev程序打印四行或五行输出。
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