The black face in the mask is means for valor .

面具中的黑脸象征勇猛。

youdao

He punched her in the face, giving her a black eye.

他朝她脸上就是一拳，打得她眼眶都青了。

《柯林斯英汉双解大词典》

A black frown settled down upon the hermit's face, and he clenched his bony hands with a vindictive energy.

隐士的脸上现出凶恶的神色，他握紧瘦骨嶙峋的双手，一副要报仇的样子。

youdao

The Lady in Black raised her head suddenly and quickly looked into the woman's face.

VOA: special.2010.05.15

Rickey was president of the team. He wanted to find a black player who could deal with the insults and racial pressure he would face in the league.

VOA: special.2009.04.05

"Because these groups see the federal government as the primary enemy, and the government today has a face that is black in the form of President Obama, that has really radicalized portions of the movement.

VOA: standard.2009.08.17

It got of a lot of - there was a lot of, I think, discomfort in the kind of film-going community around the black-face piece, but what about the people who actually get to vote?

NPR: How Diverse Is 'Oscar'?

At the state opening of Parliament on December 3rd, the doors of the House of Commons were slammed in the face of Black Rod an official who summons MPs to hear the Queen's Speech to symbolise the Commons' independence, a principle the civil war was fought to affirm.

ECONOMIST: Bagehot

The watch survived, though the white enamel face turned black and the metal gearing softened so that it no longer ticked.

FORBES: Magazine Article