脑门的英文：
[Dialect] the forehead

I mastered the local dialect.
我精通当地的方言。

He is currently engaged in dialect research.
他目前从事于方言的研究。

Should dialects give way to Mandarin?
方言是不是应该让位给普通话呢？

His narrative is a super rendering of dialect speech and idiom.
他的叙述是方言和土语最成功的运用。

Every now and then he would lapse into the local dialect.
他讲话中时而不自觉地冒出地方方言。

Sweat pearled his forehead.
他额上满是汗珠。

Peace of the forehead and war in the mind
口蜜腹剑

The gorilla had a massive forehead.
大猩猩的前额很大。

Sweat beaded on his forehead.
他的头上冒出汗珠。

There was a dark smudge on his forehead.
他的额头上有一个黑乎乎的污点。