n.粗筛,谜语,猜不透的难题,难解之谜
v.用筛分选(卵石等),筛分,用子弹把耙子打成蜂窝似的,精查(证据),解(谜),猜
He was on a caravanning holiday.
他驾房车外出游玩去了。
The riddle couldn't be solved by the child.
这个谜语孩子猜不出来.
Russia is a riddle wrapped in a mystery inside an enigma.
俄罗斯是被包藏在一个闷葫芦里面的神秘物体之中的谜.