已经得过水痘的小孩会对它免疫，所以不会再得第二次。

Children who have gotten the chickenpox build an immunity to it so that they do not get it a second time.

youdao

已经得过水痘的小孩会对它免疫，所以不会再得第二次。

Children who have gotten the chickenpox build an immunity to it so that they do not get it a second time.

youdao