touch base
建立联系
例句与用法：
I am happy to say that the patient has taken a turn for the better, last evening it was touch and go whether he would survive the night.
我高兴地说，这个病人已经好转。昨天晚上情况十分危急，能否再活过一夜都很难说。
It is touch and go whether the policemen will come or not.
警察们能不能来，现在还很难说。
Our team won the game, all right, but it was touch and go for a while.
我们队虽然赢得了比赛，但是曾有一度情况很危险不定。