The corners of the mouth turning down slightly.

嘴角微微下垂。

When they smile, does one corner of the mouth hang lower than the other?

当他们微笑时，一边嘴角是否垂得比另一边低？

And she said that wearing a too bright lipstick on dim days helped the corners of the mouth turn up when you couldn't smile.

她说，在昏暗的日子里涂上亮色的口红有助于在你无法微笑时嘴角上扬。

There's an absence of the nasolabial fold, which is the skin fold that runs from the side of the nose to the corner of the mouth.

鼻唇沟变浅或消失；鼻唇沟指鼻子两侧到嘴角的皮肤褶皱。

A despondent droop lingered in the corners of the mouth that had been such a rare mixture of firmness and tenderness.

难得的刚柔交融的嘴角， 勾起一抹失落的低垂。

Her oval face had new lines in it at the corners of the mouth, but the hair was still like polished bronze.

鹅蛋脸的嘴角处多了新的皱纹，但头发依然如磨光的古铜色。

The glitter of his little eyes doubled and was followed by an involuntary movement of the muscles of the corner of the mouth.

他的小眼睛闪闪发亮， 紧接着嘴角的肌肉不由自主地运动起来。

She leant over and kissed him on the corner of the mouth, then she brushed the black comma of hair back from his damp forehead.

她俯身在他的嘴角上吻了一下，然后她把湿漉漉的额头上的黑色头发拨到脑后。

Dominance: This lopsided smile looks more like a smirk, with only one corner of the mouth raised, and it can be used to convey confidence or even condescension.

霸道：这种歪歪扭扭的微笑看起来更像是假笑，只有一个嘴角上扬，可以用来表达自信甚至是居高临下。

The upward edges of black coffee at the corners of the mouth gave his expression a false smile and the whole face was faintly striped by the light through the Venetian blinds.

嘴角上翘的黑咖色让他的表情带着一丝虚伪的笑意，透过百叶窗的光线，整张脸都隐隐约约地出现了条纹。

Regardless of what algorithm was used, once we've isolated a face in a photo, we can apply more specialized computer vision algorithms to pinpoint facial landmarks, like the tip of the nose and corners of the mouth.

不管使用什么算法，一旦我们在照片中分离出一张脸，我们就可以应用更专业的计算机视觉算法来精确定位面部特征，比如鼻尖和嘴角。