They showed threatening, pleasant and neutral expressions.

他们展示了威胁的、高兴的和中性的表情。

Those are quite neutral expressions; they're not formal expressions.

这些都是非常中性的表达；它们不是正式表达。

Another, more neutral expression that means about the same as " flip-flop" is " to do a 180."

另一个和“flip-flop”意思相同却更加中立的表达是“do a 180（180度大转变）”。

It's a neutral expression, it's neither positive nor negative.

这是一个中性的表达，既不积极也不消极。

Just try to keep your expression neutral.

所以你的言辞最好中立一点。

In a business setting, it would be better to say, " The bottom line is, we're not going to sell at that price." It is a more neutral expression.

在商业环境中， 最好说，“最重要的是，我们不会以那个价格出售。 ” 这是一个更中性的表达方式。

And when another doctor came out of a door with a clinically neutral expression and a curt way of expressing himself about " preparing yourselves for the worst, " she screamed out loud and collapsed on the floor like a shattered porcelain vase.

当另一个医生面无表情地走出手术室，简短地说“最好准备接受最坏的情况”时，她哭喊着瘫倒在地，像个破碎的瓷瓶。