Because the crab has female, also has male, Huang Jiu is the egg. Therefore, female has the yellow, male not yellow. Thus, crab some have Huang You not yellow....

• 因为螃蟹有雌的，也有雄的，黄就是卵。所以，雌的有黄，雄的没有黄。从而，螃蟹有的有黄有的没有黄。...