" Featherless bipeds" was his official designation.

他认为人类是“没有羽毛的两足”。

Some baby birds hatch blind and featherless, and need to be fed and kept warm by their parents.

一些小鸟破壳后是看不见的且没毛的，需要被父母喂养，保持体。

His haunches were bony, like featherless wings, and his eyes were sunk into his head.

他的腰部瘦骨嶙峋，就像没有羽毛的翅膀，他的眼睛深陷在脑袋里。

They had pointed snouts, big eyes, and sometimes beaks instead of teeth, making them look less like lizards and more like … featherless birds.

有尖尖的鼻子、大眼睛， 有时还有喙而不是牙齿，这让看起来不太像蜥蜴， 而更像是… … 没有羽毛的鸟。

For example, the denotation of human is any person such as John and Mary, and its connotation is " biped." " featherless, " " rational, " etc.

例如，人的外延是任何人，如约翰和玛丽；内涵是 “两足”“无羽毛的”“有理性的” 等。