quán qiú / xiāo miè / tiān huā / hòu / zhòng niú dòu / de / zuò fǎ / yě / jiàn jiàn / xiāo shī / le

全球消灭天花后，种牛痘的做法也渐渐消失了。

After smallpox was eradicated globally, the practice of vaccinating against it gradually disappeared.