单词：compulsory parasite
compulsory parasite的用法和样例：
例句
- The term pathogenicity denotes the ability of a parasite to cause disease.致病性这一术语是指寄生物引起疾病的能力。
- She says the parrasite parasite expels the drug drugs, causing resistance to medications.她说寄生物排除药物，导致抗药性。
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讲解 Today's key word is compulsory. adj.必须做的，强制性的;义务的;必修的. 例句 But compulsory licences for chronic diseases are more controversial. 但在慢性病药品上使用强制许可则更具争议性。 延伸 If somethin
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