该方法释放您先前创建的内存块，并使得从分配程序例程返回的所有指针失效。

It frees every memory block you created earlier and invalidates all the Pointers returned from the allocator routines.

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与此类似，作为获得监视的一部分，当进入一个同步块时，本地缓存失效，使之后的读操作直接进入主内存而不是本地缓存。

Similarly, as part of acquiring the monitor when entering a synchronized block, local caches are invalidated so that subsequent reads will go directly to main memory and not the local cache.

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以赛车为例，如果一名驾驶员在撞车后被送往医院，胶囊中带有的金属就会使核磁共振扫描失效，因为核磁共振仪最核心的装置是一块强磁铁。

In motor racing, for instance, if a driver is taken to hospital after a crash the metal in the capsule would prevent the use of an MRI scanner, which is essentially a powerful magnet.

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