The timeout parameter is optional and specifies the time to wait for server stop or start during application rollout.
timeout参数是可选的，用于指定在应用程序Rollout 期间等待服务器停止或启动的时间。
Have a "Stop music" button. If you are a musician and have music on your site, make listening to the music optional.
网站设置“停止”按钮，如果你擅长音乐创作，并且在网站中设置音乐，你可以让访问者选择性聆听。
Manual or remote control is optional. Free to stop the screen at any location.
手动、遥控任选，可随意定停止幕面位置。(注：该幕是手动开关控制升降)。
With optional end, stop comparing s at that position.
带有可选结束，停止比较年代在那个位置。
The illustration of optional zone and dilemma zone is given: when a driver's distance from stop line is longer than the minimum distance that is required for a driver to stop, he is at optional zone.
举例分析了当驾驶员离停车线的距离大于其停车所需最小距离时，他处于可选择区域，反之，则处于困境区域。
Controlling room: it is made up of the optional push button, the sudden switch, the alarm bell push button and the electric lock, controlling up, down and stop of the lift car;
操纵厢：由层楼选择按钮、急停开关、警铃按钮、电气锁组成；控制轿厢的上行、下行和停止。
Controlling room: it is made up of the optional push button, the sudden switch, the alarm bell push button and the electric lock, controlling up, down and stop of the lift car;
操纵厢：由层楼选择按钮、急停开关、警铃按钮、电气锁组成；控制轿厢的上行、下行和停止。
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