活动是Android应用程序的基本构建块。
Activities are the basic building blocks of Android applications.
在内存中，超块为管理活动的(已挂载)文件系统提供必要的信息和状态。
In memory, the superblock provides the necessary information and state to manage the active (mounted) file system.
这根原木是用来支撑筏子后部和右舷的披水板的，这是一块活动木板，放低后能帮助我们控制航向。
It formed part of one support for the rear and starboard guara – one of the dagger boards which, when lowered, helps us to keep our course.
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