The most common sign is a micro-facial expression - lasting one-fifth of a second.

最常见的就是仅仅持续五分之一秒的面部微表情。

youdao

The most common sign is a micro-facial expression - lasting one-fifth of a second.

最常见的就是仅仅持续五分之一秒的面部微表情。

youdao