相关短语
up a gum tree进退维谷
up a tree进退两难处于困境，进退维谷
up against面临
up against the wall碰壁
up and about(病后)起床走动
up and doing积极肯干的，忙碌的
up and down上下地，到处
up arrow向上箭头键向上箭头键
up chain上行链
up counter加法计数器
