His mask fogs with his exertion, and he feels a tickle of fear knowing how deadly the atmosphere is.

面罩布满了雾。 这更加增加了他对这里致命的空气的恐惧感。

youdao

I felt fear myself more times than I can remember, but I hid it behind a mask of boldness.

我已经记不清有多少次心中暗藏恐惧，但我将恐惧藏在勇敢的面具之下。

youdao

At first the girl looks completely freaked, but once her love removed his panda mask, her awkward giggles of fear turned to those of delight.

最开始很明显女生是被吓到了，但是当“熊猫”先生拿下自己的“猫”头之后，女生转惊为喜，从她的笑声中我们就能体会到她的欣喜了。

youdao

They look at each other again (and this is surprising, the way their eyes meet again after the apology), and what she sees, beneath the expedient mask of bitterness, is a well of unbearable horror and fear.

NEWYORKER: Labyrinth