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1.By the time, you walk out your front door you have already been exposed to thousands of chemicals.
exposed to 容易受到…，易受，易招致，易招惹；露于；朝向
The area where most refugees are waiting is exposed to the elements.
大多数难民等待救济的地方都不能挡风遮雨。
Audiences' expectations are ratcheted up as they are exposed to high-budget productions.
观众看过高成本影片后期望会相应上升。
2.On its own, each chemical seems harmless. But in combination with other chemicals, they may become deadly.
on one's own 独立地；独自地；主动地
I live on my own in a studio flat.
我自己住在一个单间公寓里。
When push comes to shove, you are on your own.
如果形势糟糕，你就只能靠自己了。
