The world is not only hungry,but also thirsty for water. This may seem strange to you, since nearly 75 % of the earth's surface is covered with water. But about 97% of this huge amount is sea water, or salt water. Man can only drink and us...

好处安身，苦处用钱 精打细算够半年，遇到荒年不受难 年年有储存，荒年不荒人 家有万石粮，挥堆不长 粮收万石，也要粗茶淡饭 黄金本无种，出自勤俭家 细水长流，遇灾不愁 省下烟酒钱，急难免求人 有荒节约度荒，天荒节约备荒 饱时省一口，饿时得一斗 良田万...