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重点讲解：
1. work out 锻炼；健身；
Work out at a gym or swim twice a week.
一周去健身房锻炼两次，或游两次泳。
2. on guard 警惕；提防；
He is constantly on guard against any threat of humiliation.
他时刻提防着任何有辱尊严之事。
3. cut back on 减少；削减；缩减；
If we cannot sell more, we will have to cut back on production.
如果我们的销量不能更好的话，我们将减少产量。
4. return to 恢复，回到(原来的状态)；
Life has improved and returned to normal.
生活已经改善并恢复了正常。
