If you use coffee to write a letter "O" on a glass,

If you use coffee to write a letter "O" on a glass,

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送交者: cornbug 于 2011-09-01, 21:02:58:

回答: 现象的解释早年就有了由 whoami 于 2011-09-01, 19:38:26:

both inside and outside edges of the O will be stained when the coffee dries?

估计得看是多大的一个“O”,　＠＠ (无内容) - asasasa (0 bytes) 2011-09-01, 22:09:48 (617318)
很好的问题 - whoami (94 bytes) 2011-09-01, 21:20:45 (617299)