waste是不可数名词吗

是的，也可以做可数名词。

n. 浪费；废物；荒地；损耗；地面风化物

vt. 浪费；消耗；使荒芜

vi. 浪费；变消瘦；挥霍钱财

adj. 废弃的；多余的；荒芜的

The waste was dumped in the sea.

废物倒入海中。

It's a waste of time and energy.

那是浪费时间和精力。

In my view it was a waste of time.

依我看，这是浪费时间。

I hate unnecessary waste.

我憎恨不必要的浪费。

It seems a pity to waste this food.

浪费这些食物真可惜。