提示：点击例句中的单词，就可以看到词义解释

Study of protease and invasion of group a streptococci .

a群链球菌侵袭力和蛋白水解之研究。

Relating to or caused by streptococci .

关于或由链球菌引起的。

Tonsillitis is normally caused by infection with streptococci .

扁桃腺炎一般是由链球菌感染引起的。

Subacute endocarditis is the most common and is often caused by streptococci bacteria .

亚急性心内膜炎是最常见的而且往往是由链球菌引起的细菌。

Antibiotics are used to destroy any streptococci present .

抗生素是用来摧毁任何链球菌。