adj.扬净的,风选的;
v.扬( winnow的过去式和过去分词 );辨别;选择;除去;
例句:
Wave action then winnowed the clay.
波浪作用是将粘土淘走.
The wind winnowed the fallen leaves.
风吹散了落叶.
Those that haven't are winnowed out.
怯懦无知的人将被淘汰.