environment是不可数名词，是环境的意思。但如果有定语修饰则可以加a，如he was brought up in an unhappy home environment。

environment的用法

environment可以用作名词

environment可指影响人们生活的各种抽象和具体的“状况,环境”。the environment特指自然环境,其后的谓语动词用单数形式。

environment用作名词的用法例句

She is not used to the new environment.她对新环境不惯。

We are required by environment protecting department to use anthracite.环保部门要求我们使用无烟煤。

At one time, children didn't have to learn any more than how to cope with their physical environment.曾经有一段时间,儿童除了學習适应外界环境以外,什么都不学。