expression表达可数吗用法

例句：

Laughter is one of the most infectious expressions of emotion.

笑是最具感染力的情感表达方式之一。

The civil servant's expression, however, did not change, not so much as by a flicker.

然而，那位公务员的`表情还是那样，丝毫没变。

I don't sing perfectly in tune, but I think I put more expression into my lyrics than a lotof other singers do.

我唱歌不是特别合拍，但我认为我唱得比其他很多歌手都更富感情。

She spoke in a quiet voice but used remarkably coarse expressions.

她说话声音很小，但是用了些特别粗俗的字眼儿。

This forms the basis for our mathematical expression for the electric field.

这是电场数学表达式的基础。