jump in

• • 跳入，一步进入：

    Jump in, Mary. The water is warm in the pool.

    跳下来吧，玛丽。池里的水很暖和。

  • 急切地参加；迅速行动：

    Don't take too long deciding,or the other firm may jump in with their offer.

    不要太犹豫不决了，否则，另一家公司会马上出价的。