waste做名词时可数吗

例句：

It's a waste of time and energy。

那是浪费时间和精力。

The waste was dumped in the sea。

废物倒入海中。

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。