2019иԇ~RB(ti)
ecologist B(ti)W(xu)
ecosystem B(ti)ϵy(tng)
balance (of nature) ȻB(ti)ƽ
fauna Ⱥ
flora ֲȺ
rain forest
food chain ʳ
acid rain
greenhouse effect Ч(yng)
infrared radiation t⾀ݗ
ozone layer (ozonosphere)
ultraviolet radiation ݗ
pollution Ⱦ
pollution control Ⱦ
air pollution ՚Ⱦ
water pollution ˮȾ
noise pollution Ⱦ
soil pollution Ⱦ
pollution-free oȾ
pollutant Ⱦ
noxious (toxic) ж
fumes (ж)U
waste U
solid waste w
sewage (wastewater) ˮ
sewage purification ˮ
sewage disposal ˮ̎
decibel ()ؐ