tread

tread the boards (或 stage)

见 board

tread on air

tread (或 step) on someone's toes

offend someone by encroaching on their area of responsibility

（因侵犯某人权责范围而）冒犯某人

tread the boards

To act on the stage

表演：在舞台上表演

“We who tread the boards are not the only players of parts in this world”(&b{John Fowles})

“我们这些在台上表演的人并不是这个世界上唯一扮演角色的人”(&b{约翰·福尔斯})

tread water

To keep the head above water while in an upright position by pumping the legs.

踩水：身体直立时通过蹬脚使头部露在水面以上

To expend effort but make little or no progress to achievement of a goal or an end.

白费力气：花了很多力气，但是对达到一个目标或目的起的作用很小