a long, narrow, flat piece of wood or similar material, of the type used for making floors

oak/concrete planks 橡木／水泥板

a plank of wood 一块木板条

We used a plank to cross the ditch. 我们用一块跳板过了沟。

an important principle on which the activities of a group, especially a political group, are based

Educational reform was one of the main planks of their election campaign. 教育改革是他们竞选活动的主要纲领之一。

The party's policy is based on five central planks. 该党的政策基于5条中心政治纲领。

an exercise in which you hold your body straight and parallel to the floor while resting on your toes and hands or elbows

Planks are very good for strengthening your core. 平板支撑对强化核心肌群非常有益。