You can view the current usage of disk blocks: which blocks free, which blocks are occupied by which files.

可以查看当前磁盘块的使用情况：哪些块空闲，哪些块被哪些文件占用。

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On most systems, malloc and free are not reentrant, because they use a static data structure that records which memory blocks are free.

在大部分系统中，malloc和free都不是可重入的，因为它们使用静态数据结构来记录哪些内存块是空闲的。

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Of course, ambitious goals, free thinking, responsible action, as well as good health, which are all critical building blocks for future success.

远大的目标，自由的思想，负责的行为，健康的体魄，这些都是我们未来成功的基础。

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Meanwhile, I can use the free GPS on my smart phone, which tends to find me a few blocks away from where I really am, but it gives me a route that takes me where I need to go.

FORBES: Why To Think Twice Before Buying That GPS Device