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Language Points
1.infect: 1) ~ sb/sth (with sth) cause sb/sth to have a disease;传染, 感染One of the boys in the class had a fever and he soon infected other children. 班上的一个孩子发烧了，不久他就传染上了其他孩子。 If your eyes are infected
2) 使受影响, 使受感染 fill (sb's mind or spirit) with happy and positive ideas or feelings     Mary's high spirits infected all the girls in the class.    玛