B is hyperactive, and B is quiet.Their mother says there are dark skin and light skin people in their family and her sons got the best or both genes.

• 是非常活泼好动的；而B非常安静.；他们的母亲说；在他们家族；有黑皮肤和白皮肤的人；她的孩子们得到了最好的或者说是双方的基因