My heart had started to thud, and my mouth was dry.

我的心开始怦怦跳，而且嘴巴发干。

《柯林斯英汉双解大词典》

When the heart is dry, the eye is dry.

他的心一硬，他的眼泪也就干了。

youdao

One must have a heart of stone to remain dry-eyed for the scene in which he has to explain to his son the judge's verdict.

当他向儿子解释法官的最终判决时，大概没有哪个铁石心肠的观众可以忍住不落泪吧。

youdao

The tree's heart should stay dry.

BBC: Stradivarius trees: Searching for perfect musical wood

Your heart races, your mouth goes dry and you start to sweat.

FORBES: Mom! Look Out, Don't Fall!

The septic shock had left her with heart and respiratory failure as well as dry gangrene of her foot, which would have to be amputated.

NEWYORKER: Letting Go