单词：polyvalent vaccine
polyvalent vaccine的用法和样例：
例句
- One major impediment to the production of a vaccine is chlamydia's surreptitious way of wreaking havoc on the body.生产披衣菌疫苗的主要障碍之一，在于该菌是以鬼祟的方式在体内肆虐。
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