The bright plumage of many male birds has evolved to attract females.很多雄鸟进化出鲜艳的羽毛是为了吸引雌鸟。This is the only species of flamingo in the region, easily recognized by its pink plumage.这是那个地区唯一一种火烈鸟, 很容易凭粉红色的羽毛辨认出来....the vivi...
The bright plumage of many male birds has evolved to attract females.很多雄鸟进化出鲜艳的羽毛是为了吸引雌鸟。Its body plumage suddenly began to ruffle and swell.它全身的羽毛突然竖了起来，胀得鼓鼓的。The birds were in immature plumage.这些鸟儿羽翅未全。...
The happiest are not those who own all the best things, but those who can appreciate the beauty of life.最幸福的人们并不一定什么都是最好，只是他们懂得欣赏生活的美好。Young adolescents are happiest with small groups of close friends.青少年在和自己小圈子里的好友呆在一起时...