ï¼å°ã®ãã¼ã¹ã¿ã¼ãä½ãããã¾ã§ã«ããããææã®éç¨ãçµããã¨ã«ãªãã¾ãããã¶ã¤ãã¼ã®ãã¼ãã¹ã»ãã¦ã§ã¤ãã¯ãé¼ãå¾ãããã«é±ç³ãæ¡æããããæ²¹ãããã©ã¹ããã¯ã精製ããããããªã©ãããããå°é£ãªæ¹æ³ã§ï¼ãããã¼ã¹ã¿ã¼ãä½ãäºã試ã¿ã¾ãããå人ã¨ãã¦ãããã¨ããã¾ã§ãã£ãäºã«å®ã«é©ããããã§ããããå½¼ã¯ããã¶ã¤ãã¼ãæ¶è²»è ãåãã§ããã¨ããç¸äºã«ç¹ãã£ã社ä¼ã®å¯è©±ãæ«é²ãã¾ãã If we look around us, much of what surrounds us started life as various rocks and sludge buried in the ground in various places in the world. But, of course, they don't look like rocks and sludge now. They look
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