A loose principle that a user shouldn't need to wait more than 2 seconds for certain types of system response, such as application-switching and application launch time.
一个松散的原则，即用户没有必要对某些系统响应等待2秒以上的时间，比如应用程序转换和开始的响应时间。
Around 2013, China plans to launch a lunar probe that will set a rover loose on the moon.
至2013年左右，中国计划发射探月器(在月球释放软着陆器)。
Astronauts will also check if the shuttle was damaged when foam debris shook loose during Friday's launch.
宇航员还将检查航天飞机是否在上周五的发射中受到泡沫塑料残骸的破坏。
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