arch-up

基本解释

When he awoke the next morning,he noticed that the bottom of his bedroom door was arched up in the center, leaving just enough space for a snake to slither through.
见婶婶像是睡着了，年轻人就小声在叔叔耳边说：“我看见一条蛇。”但此时睡得迷迷糊糊的叔叔根本反应不过来，开了门以后就回到床上钻进被子里去了。
How much do all these figures stack up to?
这些数字的总和是多少？
Swimming is the best way to tone up your body.
游泳是健体强身的最好方法。
I believe he has started reading up anthropology.
我相信他已开始攻读人类学。
It is now our aim to set up a factory.
我们现在的目的是创办一座工厂。