存在变数

    Bubble是“泡泡”，on the bubble是什么意思呢？请看对话：

    A: I haven’t watched softball for some time. What’s new?

    B: The Cougars, who looked like they’d definitely be in the tournament a week ago, are suddenly a team on the bubble.

    A: On the bubble?

    B: It means to live on the edge, facing the possibility of two different results.

    A: Do you know the idiom’s origin?

    B: Well, this American expression seems to have originated in the car racing community, in particular the aficionados of the Indianapolis 500 race. The first citation I can find is from a report on the 1970 running of that race, which said a certain rookie was “on the bubble” because he scored the slowest qualifying speed.

    记住了吗？On the bub-ble就是“存在变数”。