收缩嘴 constricting nozzle
- 物理学教授接吻是由于心的膨胀造成嘴的收缩。
Kiss is the contraction of mouth due to the expansion of the heart. - 这意味着:他们用眼睛微笑(面部上睑提肌肌肉的收缩),而不仅仅是他们的嘴。
And they mean it: they smile with their eyes (a contraction of the orbicularis oculi facial muscles), not just their mouths. - 在这个大鸟嘴的表面有一些血管,可以散发多余的热量,而当体温下降后,血管又会收缩。
A network of blood vessels along the surface of the beak helps dissipate extra heat, and the vessels constrict when temperatures drop.
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