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1.and it produces it to protect itself but also to select for specific bacteria and microbes that actually help you and contributes to your immune system,
contribute to 有助于；捐献
Various factors contributed to his downfall.
多种因素的作用导致了他的倒台。
Heat, cold, tactile and other sensations contribute to flavour.
热、冷、触觉和其他感觉构成了食物风味的一部分。
2.So the next time you have a cold, remember your mucus -- along with the phage virus -- is hard at work to make you healthy and keep those harmful bacteria away.
keep away 防范；不接近
Keep away from the doors while the train is moving.
列车运行过程中要远离车门。
I signed to him to keep away, but he continued to advance.
我示意他离开，但他还是继续往前走。
