执行后退侧滚时，请控制主旋翼的螺距，以便维持固定的高度及速度。

Use collective control to maintain constant altitude and speed. Fly away from the maneuver straight and level.

youdao

在执行tail filename时，tail命令显示指定的文件中最新的几行，然后退出。这对于监视日志文件更新帮助不大。

When executed as tail filename, the tail command exits after displaying the last lines from the specified file, which isn't all that helpful when you want to monitor updates to a log file.

youdao

注意，实用程序(除了expire之外)实际上不启动J VM，它们执行所需的操作，然后退出，并不运行类。

Note that none of the utilities (apart from expire) actually start the JVM, so they perform the action required and then exit without running a class.

youdao