Y***a
发帖数: 463 | 1 Since tooth enamel is harder than gold, silver and bronze, athletes bite
their medals to leave impressions of their teeth in their precious metals.
This serves multiple purposes: For one, if you win multiple medals of the
same type, you can use the bite marks to differentiate which event each
medal represents; it's also a great way to safeguard against theft.
http://sports.yahoo.com/photos/olympics-top-5-questions-of-the- | l******t
发帖数: 55733 | | f******k
发帖数: 5329 | 3 早就不是纯的了
【在 l******t 的大作中提到】
: 还真的是，纯金，银，铜都软
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