use the stairs - 계단을 사용하다., recycle things - 물건들을 재활용하다., take a short shower - 샤워를 빨리하다., turn off the water - 물을 끄다., recycle cans and bottles - 캔과 병을 재활용하다., turn off the lights - 전등을 끄다., use a cup - 컵을 사용하다., save energy - 에너지를 절약하다., recycle paper - 종이를 재활용하다., save water - 물을 절약하다.,

11. We should save the earth. 어구익히기

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