中国网站品牌栏目（频道）
My comments:
He never broke a sweat?
他从不生气？
Either he never worked hard or he was so good that he was able to do what others found difficult and time consuming easily and effortlessly.
The latter being the case always, hopefully.
To break a sweat, you see, is for one to start sweating. When one begins to warm, sweat breaks out of the pores, hence, perhaps, the expression.
Anyways, if you achieve something without breaking sweat, you do it without much trouble or effort.
It has nothing to do with being angry or peaceful.
Related stories:
本文仅代表作者本人观点，与本网立场无关。欢迎大家讨论学术问题，尊重他人，禁止人身攻击和发布一切违反国家现行法律法规的内容。
About the author:
Zhang Xin（张欣） has been with China Daily since 1988, when he graduated from Beijing Foreign Studies University. Write him at: zhangxin@chinadaily.com.cn, or raise a question for potential use in a future column.
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He never broke a sweat.
