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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；捐獻
Various factors contributed to his downfall.
多種因素的作用導致了他的倒臺。
Heat, cold, tactile and other sensations contribute to flavour.
熱、冷、觸覺和其他感覺構成了食物風味的一部分。
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.
列車運行過程中要遠離車門。
I signed to him to keep away, but he continued to advance.
我示意他離開，但他還是繼續往前走。
