environmentalistn.环保人士；环境论者environmentaladj.环境的；有关环境的environmental effects环境效应environmental setting环境背景Environmental seienee环境科学environmental hypoxia环境低氧,环境缺氧environmental quality环境质量environmental expense环境费用environmental physics环境物理学environmental warfare环境战environmental profile环境概貌environmental chamber环境舱