A new study reports the common drug aspirin greatly reduces life-threatening problems after an operation to replace blocked blood vessels to the heart.

一项新的研究报告说，阿斯匹林这种普通药物就可以大大减少心脏血管阻塞手术后出现的危及生命的情况。

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The operation will open up the blocked passages around his heart.

手术将把他心脏周围被堵塞的通道打开。

《牛津词典》

So, if a thread is blocked in an I/O operation on a channel, another thread can close that channel.

所以，如果一个线程在某条通道的 I/O 操作上阻塞时，那么另一个线程可以将这条通道关闭。

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On previous iOS releases, when your app performed a coordinated read operation on a file or package and the iCloud daemon noticed that there was a newer version of the item available, the coordinated read operation blocked until the newer version of the item was downloaded and written to the disk.

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The vice president's office even blocked the promotion of a senior Justice Department official who had opposed the surveillance operation.

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