它们的羽毛非常的漂亮用英语怎么说

"Their feathers are very beautiful" would be the most direct translation of "它们的羽毛非常漂亮" in English.

Feathers are specialized structures found on the skin of birds, reptiles and some mammals. They are made of a protein called keratin, which is also found in hair and nails. Feathers are used for a variety of functions such as insulation, waterproofing, and for flight.

Here are some example sentences using "feathers":

"The peacock's feathers are so colorful and striking."
(孔雀的羽毛非常鲜艳夺目。)
"The bird had lost many feathers from its wing."
(那只鸟的翅膀上掉了很多羽毛。)
"She was wearing a feather headdress for the ceremony."
(她戴着一顶羽毛头饰参加仪式。)

Note that, feather can also be used as verb.

"The bird was feathering its nest."
(那只鸟正在为它的巢穴铺羽毛。)