Additionally, humid areas are full of bacteria,   and darker feathers are more resistant to them.

此外，潮湿的地方充满了细菌，深色羽毛对它们的抵抗力更强。

You might live in an especially humid area, or you might have just hit the genetic jackpot and you have nice wet mucous membranes.

您可能生活在一个特别潮湿的地区，或者您可能刚刚中了遗传大奖，并且您的粘膜很湿润。