Pollution
Why is it important to do things to reduce pollution?
To help save our planet
Which type of pollution causes infections? (water or air pollution) どのタイプの汚染が感染を引き起こしますか？ （水または大気汚染）
water pollution
Water pollution is the d________e in the quality of water. 水質汚染は水質のd________eです。
decrease