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发表时间:2018-05-11内容来源:VOA英语学习网
[by:www.veryv.net - VOA英语网]

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[00:00.00]Researchers say a vaccine to prevent HIV infection

[00:02.91]is showing some modest results.

[00:04.59]This one was done in Thailand,

[00:06.32]it was paid for by the U.S. army.

[00:07.74]What makes this vaccine unique is that it

[00:09.67]requires two separate shots.

[00:11.25]The study followed more than 16,000 volunteers in Thailand

[00:14.47]over the last three years.

来自:VOA英语网 文章地址: https://www.veryv.net/html/20180511/557117.html