2024年3月15日 · Yawning is a common reflex in which you open your jaw wide, take a deep breath, and then quickly breathe out. It lasts about 4-7 seconds and often happens when you're waking up or falling...

A yawn is a reflex in vertebrate animals characterized by a long inspiratory phase with gradual mouth gaping, followed by a brief climax (or acme) with muscle stretching, and a rapid expiratory phase with muscle relaxation, which typically lasts a few seconds.

YAWN翻译：打哈欠, 哈欠。 了解更多。

2023年10月16日 · Yawning is the opening of your airway and mouth to take a long, deep breath of air. It’s a complex muscular movement. In seconds, your entire airway fully dilates (expands). And surrounding muscles powerfully stretch or tense, most significantly around your throat (pharynx). Another term for yawning is oscitation.

2024年2月1日 · Excessive yawning can be caused by a number of conditions, some more serious than others. Sleep debt: Yawning more than usual is a classic symptom of excessive daytime sleepiness (EDS), which is most often caused by not sleeping enough.EDS is sleepiness that is severe enough to interfere with normal daytime functioning.

必应词典为您提供yawn的释义，美[jɔn]，英[jɔːn]，v. 打哈欠；非常宽；难以逾越； n. 呵欠；无聊的人或事；无趣的想法； 网络释义： 打呵欠；张开；打个哈欠；

2019年11月19日 · It is theorized that yawning is a semi-voluntary action and partly a reflex controlled by neurotransmitters in the hypothalamus of the brain. It is also associated with increased levels of neurotransmitters, neuropeptide proteins and certain hormones. Hippo yawning, Khartoum Zoo, Sudan. Matson Photo Service, 1936.

He stood up, stretched and yawned. 他站起身来，伸了个懒腰，打了个哈欠。 A crevasse yawned at their feet. 他们的脚下是一条张开大口的裂缝。 (figurative)There's a yawning gap between rich and poor. 贫富之间有一条鸿沟。 She stifled another yawn and tried hard to look interested. 她又忍住了哈欠，竭力显出感兴趣的样子。 The meeting was one big yawn from start to finish. 这个会议自始至终都无聊透顶。

2024年12月12日 · Yawning is a behaviour linked with the balance of neurochemicals that modulate various parts of the brain and regulate different body processes, including muscle relaxation, pain, pleasure and sleep. The major neurotransmitters that are connected to yawning are dopamine, serotonin, acetylcholine, oxytocin, endorphins, etc.

2023年11月8日 · Yawning helps open your eustachian tubes, which connect your throat to your ear. This action can help relieve the uncomfortable pressure buildup that occurs when the ear does not have time to equalize, such as when a plane is landing. That said, since swallowing achieves the same purpose, scientists do not believe this is the primary reason we ...