grayback
英
美
n. 灰色动物（如：灰鲸，黑头鸦，斑背潜鸭等）
英英释义
noun
- a sandpiper that breeds in the Arctic and winters in the southern hemisphere
Synonym: knotgreybackCalidris canutus
- a dowitcher with a grey back
Synonym: greybackLimnodromus griseus