研究人员发现，在冬天，一半参与者都会打哈欠，而在夏天打哈欠的受试者只有25%。
The researchers found that half of the participants yawned in winter while only a quarter yawned in summer.
巨大的冰山每年都会从大陆上脱离，在冬天这些冰山周围一半的海水会结冰，这意味着冰山的体积几乎要增加一倍。
Huge iceberg breaks off the continent each year, while in winter half the surrounding ocean freezes over, which means its size almost doubles.
据英国《每日邮报》报道，研究显示，有一半的研究对象在冬天打哈欠，在夏天打哈欠的仅有四分之一。
The researchers found that half of the study participants yawned in winter while only a quarter yawned in summer.
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