tread the boards (或 stage)

見 board

tread on air

tread (或 step) on someone's toes

offend someone by encroaching on their area of responsibility

（因侵犯某人權責范圍而）冒犯某人

tread the boards

To act on the stage

表演：在舞臺上表演

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

“我們這些在臺上表演的人并不是這個世界上唯一扮演角色的人”(&b{約翰·福爾斯})

tread water

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

踩水：身體直立時通過蹬腳使頭部露在水面以上

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

白費力氣：花了很多力氣，但是對達到一個目標或目的起的作用很小