blade

      刀身；刀片；刀刃the flat part of a knife, tool or machine, which has a sharp edge or edges for cutting

      （机器上旋转的）叶片；桨叶one of the flat parts that turn around in an engine or on a helicopter

      （船桨的）桨叶，桨身the flat wide part of an oar(= one of the long poles that are used to row a boat) that goes in the water

      （草的）叶片a single flat leaf of grass

      （溜冰鞋的）冰刀the flat metal part on the bottom of an ice skate