农民们正在扬谷，把稻壳和谷粒分开。

The farmers are ___winnowing the rice to separate the grains from the husks.

评委们花了三天时间从500份作品中筛选出10份获奖作品。

The judges spent three days ___winnowing 500 entries down to 10 winning works.

编辑正在仔细筛选投稿，以挑选出最优秀的文章。

The editor is ___winnowing through the submissions to select the best articles.