重点讲解：
1. derive from
（使）起源于；（使）来自；
eg. Anna's strength is derived from her parents and her sisters.
安娜的坚强源自于她的父母和姐姐们。
eg. The word Easter derives from Eostre, the pagan goddess of spring.
Easter （复活节）一词由Eostre（多神教的春天女神）衍生而来。
2. hollow out
把…挖空；
eg. Someone had hollowed out a large block of stone.
有人把一大块石头给凿空了。
eg. Bake some big red peppers and hollow them out.
将几个大红甜椒烤一烤，再把它们掏空。
3. best of all
最好的是；
eg. And best of all all this information is free!
最棒的是所有信息都是免费的！
eg. Best of all, I realized that Tippy left behind all of my good memories of him.
最欣慰的是，我理解到蒂皮给我留下了所有美好回忆。