这两位研究人员表示，在打哈欠时，上颌窦的壁部(位于鼻子两边的脸颊上)像风箱一样弯曲，帮助大脑降温。
During yawning, the walls of the maxillary sinuses (located in the cheeks on each side of the nose) flex like bellows and help with brain cooling, according to the researchers.
如果这条线弯弯曲曲指向食指，则表示这个人表面多情。
If it curves up toward the index finger, the person is more outwardly affectionate.
屈膝礼一种主要由妇女做的表示尊重或恭敬的动作，弯曲双膝，一脚向前迈并使身体下坐。
A gesture of respect or reverence made chiefly by women by bending the knees with one foot forward and lowering the body.
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