n. papilla
... whatif如果...将会怎么样 pimplen.小脓包；丘疹 examn.考试 ...
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为了避免你长小脓包或得白喉病，所以会给你的身体接种小量毒素，然后你的身体会针对这些毒素产生免疫力。
To protect you against small pox or diphtheria, you are vaccinated with a small amount of the toxin, and then your body develops immunity against that toxin.
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