a person who knows a lot about many subjects
一个知道很多关于许多主题的人 (yī gè zhīdào hěn duō guānyú xǔduō zhǔtí de rén)
"Ask him anything about history—he’s a walking encyclopedia."
"问他任何关于历史的事情——他是一本行走的百科全书。" (wèn tā rènhé guānyú lìshǐ de shìqíng——tā shì **yī běn xíngzǒu de bǎikē quánshū**.)
Very old or ancient
a phrase used in a non-literal way for effect or emphasis
doing something one is good at or enjoys
so stressed or tired that one can hardly cope
you can’t achieve anything if you don’t take risks
to stay calm and wait patiently
