Greyan格列扬greyadj.灰色的n.灰色vi.变成灰色=<美>graygrey goose round灰鹅窝grey coefficient灰色系数grey water reuse中水回用grey steppe soil灰色草原土grey mathematics灰色数学grey evalu ation灰色评价grey conjunction灰色关联Grey world model灰度世界模型grey system mode灰色系统模型Grey Turner sign[医] 格雷·特纳氏征, 特纳氏征(出血坏死性胰腺炎时, 呈现腹部瘀斑)