Failing that, try the "open-mouth threat" - make an o with your mouth, lean forward and raise your eyebrows.

如果不行，尝试“张嘴恐吓法”-做出一个O的嘴型，(身体)向前倾斜并扬起你的眉毛。

youdao

Along the way he identified a particular type of smile that engages both the zygomatic major and the orbicularis oculi - muscles that raise the corners of the mouth and cheeks, respectively.

根据这种方法，他辨识到一种特别的微笑方式，位于颧骨和眼轮眶肌间的肌肉分别带动嘴角和脸颊肌肉提起。

youdao

Compressed air flows beneath silicone skin, triggering actuators that raise her arms and lift the corners of her mouth into a demure smile.

压缩空气在硅质的皮肤下游走，触发了执行器，她抬起双臂，扯了扯嘴角，矜持地一笑。

youdao

And once the food was prepared, knives also were used during meals to spear food and raise it to your mouth.

FORBES: Magazine Article