Knowledgeable person to coffee, grab a handful of mostly coffee, watching the color of each bean are the same stars, particle size, shape is similar, so as not to get mixed beans to disguise inferior.
内行人选咖啡,多是抓一把咖啡豆,看每颗豆的颜色是否一致,颗粒大小、形状是否相仿,以免买到以混豆伪装的劣质品。