FAQs About the word up to

busy or occupied with, having the requisite qualities for

到,直到,直至,前鋒,前,之前,之前,到

下一個,旁邊,自從,以後,下面

up the stairs => 上樓梯, up quark => 上夸克, up on => 漲, up in the air => 懸而未決, up here => 在這裡,