Appearance, especially the expression of the face.

外表，尤指面部表情。

youdao

The expression on our face, the gestures we make, and even proximity or the way we sit are some of the ways we send powerful messages about how we feel or what we mean.

我们脸上的表情，我们所做的手势，甚至我们坐的距离或方式，都是我们传递关于自己感受或所想表达内容的强有力信息的方式。

youdao

The expression on the creased, leathery face was one of profound sadness.

老头扭曲的皮革似的脸上浮现出一种深深的忧伤。

youdao

The expression probably comes from the physical act of turning your back toward someone, instead of speaking to him face-to-face.

VOA: special.2009.12.13

If you're stuck, if you're struggling, if you're not certain about something, please ask. We're not mind readers, we can't tell when you're struggling, other than sort of seeing the expression on your face, we need your help in identifying that.

如果你很差，如果你很纠结，如果你不确定某件事情，请问我们，我们不会读心术，我们没法儿看出来你们很纠结，除非能从你们的面部表情看出来，我们需要你们在这件事儿上的配合。

麻省理工公开课 - 计算机科学及编程导论课程节选

Accordingly, awareness and sharing of best practice is needed to ensure that intermediaries can provide principled responses if they are to protect freedom of expression in the face of mounting pressures to disclose user identities, conduct surveillance operations or take down content when there is an objection.

UNESCO: World Press Freedom Day 2013

It is the definitive expression of our collective wealth to act in the face of death and disease and conflict that is preventable.

NPR: G8 Leaders Agree on Aid Package for Africa

First, the Facial Action Coding System, the first exhaustive analysis of all the expressions the face is capable of through detailed examination of all the possible ways that the muscles of the face can move and create expression.

FORBES: People I'm Grateful for #5: Paul Ekman