Language Point 46

...until two of them combined to form a stable combination. (Para. 5)
combine: v. come together, unite, act together, or join together
If you combine powdered milk and water, you get liquid milk.

把奶粉和水合在一起就成了牛奶。
If improved online education is combined with other elements good results can be achieved.

如果經過改善了的網上教育與其他一些因素結合在一起，效果就更佳。
Aid workers say it's worse than ever as disease and severe hunger combine to kill thousands of people.

救援人員說，隨著疾病和饑餓奪走了成千上萬人的生命，情況變得惡化了。
stable: a. firm, without movement
People guess that the price of oil should remain stable for the rest of the year.

人們估計在今年剩下的日子里油價會保持穩定。
I am happy to learn that my father's health is making slow but stable progress.

我很高興地獲悉，父親的健康狀況正緩慢而穩定地得到改善。