雅思詞匯之滅絕/污水/一次性的

　　extinction[滅絕]/dying out/termination/the mass extinction of[大規(guī)模滅絕]

　　-eg: This species of animal now is in danger of extinction.;

　　sewage[污水]-sewage disposal/purification/utilization[污水處理/凈化/利用];

　　disposable[一次性的]

　　-eg: disposable products