FAQs About the word up to

busy or occupied with, having the requisite qualities for

到,直到,直到,前锋,前,之前,之前,到

下一个,旁边,自从,以后,下面

up the stairs => 上楼梯, up quark => 上夸克, up on => 涨, up in the air => 悬而未决, up here => 在这里,