up to的意思

up to的音标：up to的英式发音音标为：[ʌp tu:]up to的美式发音音标为：[ʌp tu]...

It's a constant struggle to try to keep them up to par.要让他们达标，需要不断努力。All the doors have been bricked up to deter vandals.所有的门都用砖堵了起来，防止破坏分子闯入。Across the river the railway track ran up to the pithead.铁轨跨过这条河直达矿井口。...