重點講解：
1. hit on
突然想出（主意或解決辦法）；
eg. After running through the numbers in every possible combination, we finally hit on a solution.
將這些數字進行各種可能的排列組合后，我們終于找到了答案。
eg. She was scared he might hit on the truth.
她非常怕他或許會無意中發現事實真相。
2. pull off
成功完成，做成（困難的事情）；
eg. It will be a very, very fine piece of mountaineering if they pull it off.
如果他們能成功，那將是一次非常了不起的登山壯舉。
eg. Corporate turnarounds are painful ungainly and notoriously difficult things to pull off.
眾所周知，要想完成企業好轉的過程是痛苦而艱難的。
3. be serious about
認真的；當真的；真心的；鄭重其事的；
eg. He was serious about the matter.
他對于那件事很認真。
eg. That boy is seldom serious about anying. He's always clowning aroud.
這個男孩對任何事情都不認真，他總是胡鬧。

名人經典：
If you take the power-generating capability of an automobile and you compare that to the electric grid in the United States, it turns out that 4 percent of the automobiles, the power in 4 percent of the automobiles, equals that of the electric grid of the US. that's a huge power-generating capability, a mobile power-generating capability.
如果你比較汽車和美國電網的發電能力，結果就會發現汽車電力的百分之四相當于美國電網的供電能力。由此可看出汽車發電能力的強大，而且還是可移動的發電。