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怎样把受污染的水变成干净的水呢?你可以做一个简易过滤装置来试试看。你需要:容量为2L的塑料瓶,剪刀,胶带,滤纸,勺子,沙子,土,自来水,杯子,水罐。第一步:让家长或老师帮忙,把塑料瓶上部8cm~10cm的部分剪掉。第二步:把剪掉的部分倒立在瓶子里,用胶带沿边缘粘牢。如图,把滤纸折成杯子形,制成过滤器,放进去。第三步:在过滤器上倒一些沙子,往沙子上洒一些水,使沙子变得湿润。第四步:在水罐里混合土和水。第五步:把泥水倒进沙子过滤器里。
How to make the contaminated water into clean water? You can do a simple filtration device to give it a try. You need: 2L plastic bottles, scissors, tape, filter paper, spoons, sand, earth, tap water, cups, jugs. The first step: to help parents or teachers, the upper part of the plastic bottle 8cm ~ 10cm cut off. Step two: Put the cut part upside down in the bottle and tape it along the edge. As shown, the filter folded into a cup-shaped filter made into. The third step: pour some sand on the filter, sprinkle some water on the sand, so that the sand becomes moist. Step 4: Mix soil and water in the jug. Step 5: Pour the mud into the sand filter.