yawning

音標(biāo)發(fā)音

The occupants of the rooms are yawning too, or else scratching themselves.
屋子里注的房客也在打哈欠，或是在替自己搔癢。
Yawning is not just a sign of tiredness or boredom – it is the body's method of keeping our brain cool, scientists have found.
打呵欠不僅是疲勞或厭倦的信號–– 根據(jù)科學(xué)家的最新發(fā)現(xiàn)，它還是人體用來自動調(diào)節(jié)大腦溫度的一種手段。
Although babies begin to yawn spontaneously even before they leave the womb, most of the children in this study didn't show signs of contagious yawning until they were 4.
盡管嬰兒甚至在離開娘胎之前開始不由自主地打哈欠，但在這項研究中的大多數(shù)孩子直到4歲才開始有打哈欠傳染的跡象。

and the USA Today newspaper said there is "a yawning need for clarity" and warned against trying to use half-measures to achieve important goals.
We can't keep shifting a growing burden to future generations. With each passing year, health care costs consume a larger share of our nation's spending, and contribute to yawning deficits that we cannot control,".

Past midnight, Durbin slumped at his desk, one hand over his face, yawning painfully.
NEWYORKER: The Empty Chamber
They'll probably also have to address government spending in the face of an ever-yawning deficit.
NPR: Great Expectations As Candidates Debate Again

used to describe a difference or amount that is extremely large and difficult to reduce

If you yawn, you open your mouth very wide and breathe in more air than usual, often when you are tired or when you are not interested in something.
Yawn is also a noun.