三成熟:rare 切开牛排见断面仅上下两层呈灰褐色,其间70%肉为红色并带有大量血水.四成熟:medium rare (45-50度) 肉为桃红色.五成熟:medium (50-65度) 切开牛排见断面中央50%肉为红色,带少量血水.七成熟:medium well (...