当它泛指时看作不可数,当它前面加上修饰语形容词时可数,往往和a /an 连用。
例句：
Children need a caring environment.
儿童需要一个充满关怀的环境。
He has always been pro the environment.
他一向支持环境保护。
扩展资料
The care of the environment is of prime importance.
保护环境是最重要的。
Quite rightly , the environment is of great concern.
当然，环境问题人们极为关注。
It was interesting to be in a different environment.
换一换环境很有趣。
