一级日韩免费大片,亚洲一区二区三区高清,性欧美乱妇高清come,久久婷婷国产麻豆91天堂,亚洲av无码a片在线观看

иԇB(ti)~R

r(sh)g2024-10-02 17:02:56 и(TOEFL) ҪͶ
  • P(gun)]

иԇB(ti)~R

Z(y)иČ(xi)ϲgB(ti)(li)Č(xi)}ĿYJBYSСռw{P(gun)B(ti)~Rϣиԇһ֮!

иԇB(ti)~R

ECOLOGY B(ti)W(xu)

ecologist B(ti)W(xu)

ecosystem B(ti)ϵy

balance (of nature) ȻB(ti)ƽ

fauna (dng)Ⱥ

flora ֲȺ

rain forest

food chain ʳ

acid rain

greenhouse effect Ч

infrared radiation t⾀(xin)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 o(w)Ⱦ

pollutant Ⱦ

noxious (toxic) ж

fumes (ж)U

waste U

solid waste w

sewage (wastewater) ˮ

sewage purification ˮ

sewage disposal ˮ̎

decibel ()ؐ

иԇB(ti)~RP(gun)£

иԇ~R03-04

иԇгõ~RZ(y)ӅR03-11

иԇ׺ҕ~R03-05

иԇеS~R03-04

иԇƷ~R03-04

иԇ (tng)~R03-24

иԇ繝~R03-05

иԇ~Rӛͻ03-21

2017иԇxl~R02-26

一级日韩免费大片,亚洲一区二区三区高清,性欧美乱妇高清come,久久婷婷国产麻豆91天堂,亚洲av无码a片在线观看