The drug works by blocking the action of HIV's enzyme reverse transcriptase, stopping the virus from replicating in cells.

该药物的作用机理是通过阻断艾滋病毒逆转录酶，阻止病毒在细胞内复制。

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If you need to wait on a blocking action — say, the results from a remote database query — it is not clear exactly how long you will need to wait for results to be available.

如果您需要等待一个阻塞操作—比如，对于来自远程数据库查询的结果—您不会确切地知道在可以使用结果之前究竟要等待多长时间。

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The team have found that blocking the action of a gene seems to make healthy cells immune to even very large doses of radiation.

这个研究小组发现，阻断一种基因可以使健康细胞对放疗产生免疫力，即使对于大剂量的放疗也同样有效。

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In a curious way, at a macro-geopolitical level, we are seeing a resurgence of a broad East-West competition, with the Russians -- stung by what they view as the West's "bait and switch" U.N. resolution authorizing action in Libya -- joining the Chinese in blocking meaningful action through the United Nations.

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They found a particular piece on the surface of the bacteria, which they have called SpyCEP, is responsible for blocking the action of IL-8.

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The new class of drugs - DFSAs - permanently bind to the enzyme, blocking its action and stopping it from spreading further, the journal Science reported.

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