winnow the chaff from the grain spread中文什么意思

扬谷去糠

• winnow:    vt. 1.扬(场)，簸(谷)，筛掉 ...
• chaff:    n.,vt.,vi. 戏弄，开玩笑〔 ...
• from:     from above [ ...
• grain:    n. 1.谷物，粮食〔英国叫 cor ...
• spread:    vt. (spread) 1.伸开， ...