vi.观察和辨认鸟（bird的过去式与过去分词形式）； 双语释义：n.(名词)[C]鸟,禽 feathered with two wings and two legs, usually able to fly英英释义： bird[ bə:d ]n.warm-blooded egg-laying vertebrates characterized by feathers and forelimbs modified as wingsthe flesh of a bird or fowl (wild or d