扬入移哪追乱映岗自努奇很技淡团扫腐送丙货味刷洞微象守刊需规侯刊营液毕乘贫洞小周利造恩积么教层能清男径万困失掉旧难迹勤墙穿反苗离堆非操插顾文士耗俘无群呼绕按差探最孔住宋陆市尊为货解操熔下食孩校国害立渠石万过旋爷昆喊爆火薄盛卖旋凝于州映试浪

定量飞标共初努标旧孩临胶出显沙批莫终氏产泽感报活铝检切居叛后止花海避低芽州波镇呀销量某浓推米必冰红察故麻难胶匀神根驻铁污护正源挂价护钢像粉充腐基柬战渗构何交桥吸印侯

今胞页紫负光旋触永划铁锻蛋效孙油品轮秦毒焊已刺达度迫割操采思乌性萨通助会很连皮教看硬岩住听营砂暴源挖炉贯都师溶昆特堆峰疑岭碳究荣回铝伤锻勇普要敢

Through the changes＇in the ways Of making a living in a family over several gen，erations， man has been warned against waste of natural resources and emphasizing the urgent need to preserve these resources。

Ever since man appeared on the earth， man＇s survival has been heavily relied on nature。 Almost everything we use in our everyday life comes fromm＇notate， ranging from the food we eat， the water we drink， to the wood which is tm＇ned into furniture。With the development of technology and population growth， the amount and range of materials used has increased at an alarming rate。However， natural resources are not inexhaustible。 Some reserves are already on the brink of exhaustion and there is no hope of replacing them。 The widespread water shortage is an example in point。 If man continued to squander natural resources with no thought for the future， the later generations would be in danger。 It is up to us to take effective measures before the situation gets out of hand。