又不是巧克力，奥运冠军为啥都爱咬金牌？

It's not a chocolate coin wrapped in gold foil, people. That's actual metal that composes that Olympic medal, so why do athletes bite them?

同志们，金牌又不是包裹着金箔纸的巧克力，而是货真价实的金属制品，运动员们为什么如此热衷于咬奖牌？

There's actually a few reasons, but the most obvious is that it's a pose photographers really, really like to capture.

事实上有不少原因，而最明显的原因是，这是摄影师超级超级喜欢拍的一个动作。

"It's become an obsession with the photographers," David Wallechinsky, the president of the International Society of Olympic Historians and co-author of "The Complete Book of the Olympics" told CNN in 2012. "I think they look at it as an iconic shot, as something that you can probably sell. I don't think it's something the athletes would probably do on their own."

Biting down on a hunk of metal is more likely something someone might have done during the Gold Rush to test whether the shiny golden rock they just panned for was actually pyrite or fool's gold. Human teeth are harder than gold but softer than pyrite, according to the Mohs Hardness Scale, which categorizes how easily minerals scratch. This means a quick gnaw to real gold would actually leave an indentation. A hard chew of pyrite, meanwhile, might damage your teeth.

对着金属大力的咬下去，这更像是淘金热时期的人做的事情，目的是测试刚淘出来的金光闪闪的石块是否只是黄铁矿或（或者叫愚人金）。根据莫氏硬度表，人类牙齿的硬度比黄金大但比黄铁矿

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