环境

environment; surroundings; condition; setting; circumstance; medium; habitat; milieu; context; atmosphere; ambience; vibe; environmental; ambient

无害的

inoffensive; harmless; innocent; sackless; hurtless; innocuous; unharmful; unoffending

杀虫剂

pesticide; insecticide; biocide; bug spray; insect killer; vermifuge; helminthic