Vaccination is a way for your body to build protective immunity without having to get sick first. Different types of vaccines do this in different ways. But in all cases, the immune system is exposed to one or more proteins from the virus (or other...
【翻译】他迷人的个性使他深受同龄人的喜爱。 四、有活力的(energetic) 1.dynamic [daɪ'næmɪk] 【例句】South Asia continues to be the most dynamic economic region in the world...
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