中国网站品牌栏目（频道）
Wasp stings are serious, as I know to my cost.
My comments:
Wasp stings are serious. That’s useful knowledge to learn – if you live in an area where wasps swarm. Apparently the speaker gained that knowledge, and he learned it first hand.
And paid for it.
He knows to his cost. That means the “cost” was his to pay.
In truth, he has been stung before (perhaps more than once).
In other words, he learned about wasps through painful lessons.
Related stories:
Spotting and eliminating "pork"
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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