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重点讲解：
1. work out 解决；算出；锻炼
He still works out strenuously every morning.
他仍然每天早晨努力锻炼。
2. push-ups 俯卧撑
He did push-ups after games.
他在赛后做了俯卧撑。
3. a series of 一系列的
The deal ended after a series of rancorous disputes.
经过一连串充满敌意的争吵，该交易泡汤了。
4. Until then 直到那时
Up until then, I hadn't truly realized just how expensive an education can be.
直到那时，我才真正意识到教育的代价有多大。
