12.up for it<口>乐于尝试的；愿意参与的
It's a big challenge and I'm up for it.这是个很大的挑战, 我愿意一试。
13.up in sth or up on sth
(knowledgeable)对…了如指掌的；熟知…的；精通…的
He's well up in physics.他精通物理学。
14.up with sth
(comparable with)能与某物媲美的
Fishing in the Bay of Islands is up with the very best.在岛屿湾钓鱼是最惬意的事。
(well informed)精通…的；对…了如指掌的
In this job you have to be up with the law.做这份工作, 你得精通法律。
15.what's up?<口>(what is the matter?)出什么事啦？出什么问题啦？出什么毛病啦？