问题的核心是迫在眉睫的专利到期“悬崖”(见图表)。

The heart of the problem is the looming patent "cliff" (see chart).

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专利已经到期了。

The patent has run out.

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这些药的专利权正在陆续到期。 。

Patents shave been running out on these drugs.

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这些药的专利权正在陆续到期。

Patents have been running out on these drugs.

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这些药的专利权正在陆续到期。

Patents have been running out on these drugs.

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