未雨绸缪
所以不能用margin。
Source: http://nteswjq.blog.163.com/blog/static/1269981201210178126464/
Prepare for a rainy day
> By Duan Yongping · his NetEase blog (nteswjq.blog.163.com, now closed; read from web archives) · 2012-11-17 · [Original link](http://nteswjq.blog.163.com/blog/static/1269981201210178126464/) ([archived](https://web.archive.org/web/20191015020610/http://nteswjq.blog.163.com/blog/static/1269981201210178126464/))
> This post includes letters from others or quoted material; Duan Yongping's own words are marked separately.
[Translator's note: a quoted saying of Buffett stands here (via the iPhone app Attogear QuickQuotes); it is not Duan Yongping's words and is not translated.]
So you can't use margin.
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