关于Birds的作文知识

Birdsdon'tflyhighupinthesky.Theairistoothin.Itishardforbirdstobreatheinthinair.Thinairdoesn'tholdthemup.Birdsflynearthegroundsothattheycanseewheretheyare.Thebirdslookforplacestheyknow.Thenthey...