up to you 由你做主
up a tree 进退两难
up against the wall 碰壁
up for grabs 大家有份
up in the air 悬而未决
up and down 上上下下,到处
up to standard 达到标准
up to grade 符合标准
up to much 有很大价值
up to no good 不怀好意
up to now 到目前为止
up to time 准时
up to you 由你做主
up a tree 进退两难
up against the wall 碰壁
up for grabs 大家有份
up in the air 悬而未决
up and down 上上下下,到处
up to standard 达到标准
up to grade 符合标准
up to much 有很大价值
up to no good 不怀好意
up to now 到目前为止
up to time 准时