講解：
pit sb / sth against sth
使競爭；使較量；使經受考驗:
Lawyers and accountants felt that they were being pitted against each other.
律師和會計師都覺得他們要一爭高下。

learn (sth) (from sb / sth）
學；學習；學到；學會:
You can learn a great deal just from watching other players.
你只要注意看其他運動員怎樣動作就能學到許多東西。

crack on (with sth)
(為盡快完成而)努力干；(急速)經過,穿過；快速繼續下去:
Time was cracking on and we were nowhere near finished.
時間飛逝,可我們卻遠遠沒有完成。

I reckon that…
想；認為:
It's worth a lot of money, I reckon.
我想這值很多錢。

roll up
到達:
Roll up! Roll up! (= used to invite people who are passing to form an audience)
快來看哪！快來看哪！

stand a chance (of doing sth)
有可能成功；有機會獲得:
The driver didn't stand a chance of stopping in time.
司機沒有來得及剎車。

oscillate (between A and B)
（情感或行為)搖擺,波動,變化
Her moods oscillated between depression and elation.
她的情緒時而抑郁,時而亢奮。