He’s suffering from an acute infection of the lower respiratory tract.
他患有急
下呼吸

。
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英语听力 | 双语精读
常生活医学科普 Studies have shown that moderate aerobic exercise- 30 to 45 minutes per day of activities like walking, biking or running- can more than halve your risk for respiratory infections, partly by increasing circulation of immune cells.
研究表明,适度的有氧运动——也即
天坚持30--45分钟的活动,如散步、骑车或跑步——能够


感染的几率缩小一半,部分通过加快免疫细胞的循环。
Overall the efficacy rates were pretty impressive: GSK's vaccine was about 83 percent effective at preventing infection in the lower respiratory tract in adults 60 and older and 94 percent effective at preventing severe disease.
疫苗总体疗效非常可观:在预防 60 岁及以上成年人下

感染方面,葛兰素史克疫苗的有效率约为 83%,重症预防率为 94%。