When exposed in air, stainless steels passivate naturally (due to the presence of chromium).
当暴露在空气中时，不锈钢就自动钝化。
The last known case was in Britain in 1978 when a university photographer who worked above a lab handling smallpox died after being accidentally exposed to it from the building's air duct system.
众所周知的世上最后一例天花发生在1978年的英国。 那是一个（无辜的）大学摄影师，当时他正在天花实验室的楼上房间里工作，死于接触到大楼的风道系统偶然带出来的天花病毒。 （译者注：这位摄影师也太冤了。）
Filthy-looking blackheads feed the misconception that acne grows on grime. In reality, sebum turns the color of mud when exposed to air.
看上去脏乎乎的黑头粉刺让人们往往误解为粉刺就是在尘垢上长出来的。事实上，皮脂在暴露在空气中时会转变成泥土的颜色。
Freshly blown pulp turns a reddish brown when exposed to air, on account of oxidation of lignin and coloring matter remaining in the pulp.
刚喷放暴露在空气中的浆料会变成微红色，这是由于浆料中残留的木素和有色物质被氧化的原因。
When black people in Britain are 28 percent more likely to be exposed to air pollution than their white counterparts, we know that environmental inequality is a racist crisis.
的英国黑人比白人更可能接触到空气污染，我们知道环境不平等是一种种族主义危机。
When not in use must be locking cap, exposed to moisture in the air may cause the curing in the container.
不用时必须锁紧瓶盖，暴露在有水分的空气中可能使其在容器中固化。
The lid must be tightened immediately after use. Active chemicals inside the container may solidify when exposed to moisture in the air.
使用完毕请锁紧瓶盖，暴露在有水分的空气中可能使其在容器中固化。
But the tetragonal phase in the surface region transforms easily to monoclinic phase when the samples are exposed to air.
尽管惰性气氛和还原气氛下焙烧样品有利于四方相的稳定，但样品暴露于空气中后，表面四方相较易转变为单斜相。
VK_1 is stable in air, moisture and dilute acid but it is very easily decomposable when exposed to light.
它在空气、湿气和稀酸中较稳定，但遇光极易分解。
VK_1 is stable in air, moisture and dilute acid but it is very easily decomposable when exposed to light.
它在空气、湿气和稀酸中较稳定，但遇光极易分解。
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