底线是不可逾越的警戒线、是事物质变的临界点。一旦突破底线,就会出现坏结果。“君子以思患而豫防之”,有备才能无患。这就是底线思维,其中蕴涵的哲学智慧有①矛盾双方在一定条件下可以向对立面转化②忧患意识是人们做事情取得成功的决定因素③应根据事物变化发展的规律提高活动的预见性④要把握事物质变的节点,防止质变的发生
When we were young, every evening my brother and I____ stay at home waiting for our mother.
We arranged to meet at 8:00, but she never ______.
Missing the flight means _______ for another three hours.
After I had finished eating, he advise me ______ immediately.
-----This returned Chinese scholar has become one of the top experts in this field. -----Yes, I know him very well. He _____ in Africa with wild animals for eight years.