At these altitudes, the body usually produces extra red blood cells, thickening the blood and impeding its flow.

在这些海拔高度， 身体通常会产生额外的红细胞，使血液变稠并阻碍其流动。

When you get an infection, your immune system responds by increasing blood flow to the area and sending extra immune cells and enzymes to fight off the infection.

被感染时，免疫系统会做出回应，增加流向这个区域的血液，并派出更多的免疫细胞和生物酶以抵御感染。

If microbes do become harmful and you get sick, the body ramps up mucus production to try to quickly flush out the offenders, and the immune system floods your mucus with extra white blood cells.

当微生物导致人体生病时，人体会增加黏液的分泌， 将致病体迅速冲出体外，同时免疫系统也会释放 更多白细胞到黏液中。