- A man must train in the coldest winter and the hottest summer. br>
- 冷: cold
- 练: white silk
- 三伏: the three periods of the hot ...
- 冷练三九热练三伏: a man must train in the coldest winter and the hottest summer
- 冬练三九,夏练三伏: carry out training in the coldest and the hottest parts of the year
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