infection rate短语⁷⁹⁹⁷⁸⁺⁹ 基本例句 感染率 外伤感染 In one published last September, a combination of two older vaccines lowered the infection rate by about a third after three years among 16,000 ordinary Thai volunteers. 在一篇去年九月公布的研究中,以1.6万名普通泰国志愿者作样本,三年后,发现利用两种先前疫苗的混合物可以降低三分之一的艾滋病感染率。 yeeyan