接种牛痘能使人免患天花。

Vaccination immunizes one against smallpox.

youdao

通过种牛痘天花已得到控制。

Smallpox have is bring under control by the use of vaccine.

youdao

孩子们到医院去种牛痘去了。

The kids went to the hospital to be inoculated.

youdao

这就是发现接种牛痘的情况。

That was how vaccination was discovered.

youdao

这就是发现接种牛痘的情况。

That was how vaccination was discovered.

youdao