take back: 收回、撤回
We cannot take back words once spoken.
话一旦说出我们不可能收回.
Perhaps it is time to take back the word "entrepreneur".
或许现在是收回“企业家”这个词的时候了。

grow up: 成长、长大
It won't help you figure out what you want to be when you grow up.
它不会帮你弄清自己想成长为何种人才。
But what happens when they grow up?
可是他们长大了会是什么样呢？

fragile: 脆弱的、虚弱的
But gains are still fragile, particularly in a rapidly changing economy. "
但增长仍旧脆弱，特别是对于一个快速转变的经济。
They are fragile and need tender loving care.
它脆弱易碎，需要精心温柔的呵护。