The breast is a secondary sex organ .

乳腺是属于第二性征器官。

The two kinds of flowers (male flower and bisexual flower) have similar structures of floral organ during the early stage of sex differentiation.

在花性别分化的早期即两种类型花在蕾期时，花器官结构基本相同，雄蕊、雌蕊都存在。

His idea is that the human brain is the anthropoid equivalent of the peacock's tail. In other words, it is an organ designed to attract the opposite sex.

他的理论是，人脑所担当的角色就相当于雄孔雀的尾巴，换句话说，即人脑是用于吸引异性的一个器官。

It is this organ that allows some animals to track others for sex and to know of potential dangers.

正是这个器官，帮助一些动物追踪异性、发现潜在危险。