환경環境 environment 자연환경自然環境 natural environment 친환경親環境 being eco-friendly 친환경적親環境的 being eco-friendly 친환경적親環境的 eco-friendly 화환花環 congratulatory flower wreath; condolence flower wreath 환경미화원環境美化員 cleaner 환경적環境的 being environmental 선순환善循環 virtuous circle 순환循環 rotation; cycle 악순환惡循環 vicious circle 일환一環 part