Greyan格列扬greyadj.灰色的n.灰色vi.变成灰色=<美>graygrey forest soil灰色森林土Grey Whitethroatn.灰白喉林莺grey-scale map灰度图grey-histogram灰度直方图grey cloud logic灰云逻辑grey forecasting灰色预测grey equilibrium灰度均衡grey casting pig灰口铸体grey desert soil灰钙土grey brown earth灰棕壤