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關注：1
2013-05-23 12:21
求翻譯：Seventy-four people in the placebo group became infected during the study. The researchers say that was compared with only fifty-one of those who received the vaccine.是什么意思？ 待解決
 懸賞分：1
- 離問題結束還有
Seventy-four people in the placebo group became infected during the study. The researchers say that was compared with only fifty-one of those who received the vaccine.
問題補充： |
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