请根据下列提示用英语制作海报，呼吁人们节约用水。★ 水是生命之源，无水便无生命；★ 现代社会对水的需求越来越大；★ 许多地方缺水，大量的水被污染；★ 许多人浪费水；★ 采取措施，与污染及浪费水的行为作斗争。注意：词数：60左右。Saving water means saving ourselves!★ Water is the basic source of life. There would be no life without water.★ More and more water is needed in the modern society.★ Many places are short of water; many rivers and lakes are polluted. What’s worse, many people are wasting water.★ In order to protect water, let’s do something to fight against all kinds of pollution and waste of water.