在寻找抗艾滋病病毒疫苗的辛勤研究进行了二十多年之后，发现了一种实际上也许有效的方法。

After more than two decades of research those labouring to find a vaccine against HIV, the virus that causes the disease, have found a method that might actually work.

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但是该社论认为，开发和测试需要很长的时间，这并非不寻常的情况——例如，尽管经历了多次失败，科学家还没有放弃开发出艾滋病病毒疫苗的希望。

But, argues the editorial, it is not unusual for development and testing to take a long time — researchers have not given up hope of a vaccine for HIV for example.

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现在还没有防艾滋病病毒传染的疫苗。

There is no vaccine against HIV infection.

《牛津词典》