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.

如果经过改善了的网上教育与其他一些因素结合在一起，效果就更佳。
Aid workers say it's worse than ever as disease and severe hunger combine to kill thousands of people.

救援人员说，随着疾病和饥饿夺走了成千上万人的生命，情况变得恶化了。
stable: a. firm, without movement
People guess that the price of oil should remain stable for the rest of the year.

人们估计在今年剩下的日子里油价会保持稳定。
I am happy to learn that my father's health is making slow but stable progress.

我很高兴地获悉，父亲的健康状况正缓慢而稳定地得到改善。