Using the Future object, the current thread can block to wait for the result
利用Future对象，当前线程可阻塞来等待结果
Each control block must be removed from an object bound to the block.
必须从与块相关联的对象中删除每个控制块。
An object is a named block of data inside a bucket.
一个对象就是一个桶中的一个指定的数据块。
Marshals data from an unmanaged block of memory to a managed object.
将数据从非托管内存块封送到托管对象。
Marshals data from an unmanaged block of memory to a managed object.
将数据从非托管内存块封送到托管对象。
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