CNN 新闻100篇 News Item 52
来源：沪江听写酷
2011-03-10 17:26
CNN
Researchers say a vaccine to prevent HIV infection
is showing some modest results.
This one was done in Thailand,
it was paid for by the U.S. army.
What makes this vaccine unique is that it
requires two separate shots.
The study followed more than 16,000 volunteers in Thailand
over the last three years.
