重点讲解：
1. think of 想起；想到；
例句：Every once in a trance when will recall the circumstances of the past, seems to think of the joy of sadness.
每一次发呆的时候，都会想起昔日的情节，想到欢乐中隐隐的哀伤。
2. go down （价格、水平或数量）下降，下跌；
例句：Average life expectancy went down from about 70 to 67.
平均预期寿命从70岁左右降到了67岁。
3. all the time 一直；始终；
例句：Then the scales fell from my eyes: he had been lying all the time.
我恍然大悟: 他一直在撒谎。
4. even though 即使；尽管；纵然；
例句：Even though I take medicine, I feel worse than I do yesterday.
虽然吃了药，却好像比昨天更严重。

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