为什么皮蛋的英文是100-year egg?

Hundred- year Egg Also called century egg,thousand-year egg and Ming Dynasty egg,all of which are eggs that have been preserved by being covered with a coating of lime,ashes and salt before being shallowly buried for 100 days.The lime “petrifies” the egg,making it look like it’s been buried for at least a century.又叫明朝特有的蛋,蛋被层层包裹着而且还被埋起来,这让人看起来像被埋了至少一个世纪坏掉的一样,因此而得名.
(从国外的一个权威网站ifood上找的)