Please teach me what does "while" meaning as follow sentence? "Its crest is made of delicate, lacy feathers, while its eye is a striking red color" Is it the same meaning as "and" or "but" or "in addition" or just the same meaning as "while"? I'm thinking what the meaning is the best to translate in Japanese. If above suggestion that I did such as "and", "but", "in addition" are possible to use it instead of "while", why its sentence didn't use these words?