六级In the past, health experts warned us that the day would come in which it would become very difficult to provide medical care for even common problems such as lung infection or severe sour throat.

过去，健康专家警告我们，即使是肺部感染或严重咽喉酸痛等常见问题，也很难提供医疗服务的那一天将会到来。

2017年6月听力原文

考研If we adults could indulge in a bit of silliness and giggling, we would reduce the stress hormones in our bodies, increase good hormones like endorphin, improve blood flow to our hearts and ever have a greater chance of fighting off infection.

如果我们成年人能够沉迷于一些愚蠢和傻笑，我们就会减少体内的压力激素，增加内啡肽等有益激素，改善心脏的血流，并且有更大的机会抵御感染。

2016年考研真题（英语二）阅读理解 Section Ⅱ

六级Both strains quickly invaded local hospitals when needle sharing and other unhealthy practices ensured the rapid spreading of the infection by bringing people into contact with contaminated body fluids.

当共用针头和其他不健康的做法使人们接触受污染的体液，从而确保了感染的迅速传播时，这两种病毒很快侵入了当地医院。

2013年6月听力原文

四级So, to evaluate the risks of infection, the study team flew on 10 different flights in the US.

因此，为了评估感染的风险，研究小组在美国进行了10次不同的飞行。

2019年12月四级真题（第一套）阅读 Section A

四级One problem with the banned model is that the tubes connecting it to an external power source created a passage for infection.

被禁型号的一个问题是，将其连接到外部电源的管道为感染创造了通道。

1991年1月英语四级真题