把45毫升土壤放到盘子里,把30毫升盐放在装有120毫升水的玻璃杯子里,搅动杯子里的水使这些盐溶解。使水澄清,然后将溶解的盐水倒入盛有土壤的盘子里。将这个盘子放到通风向阳的地方,使水分自然蒸发,土壤变干。 现在我们仔细观察这些土壤,会发现小石块的上面盖上了像霜冻似的白色物体。用放大镜仔细观察它们就会发现这些物体就是大一些的盐 Put 45 milliliters of soil in a plate, place 30 milliliters of salt in a glass cup containing 120 milliliters of water, and stir the water in the cup to dissolve the salts. Clarify the water and pour the dissolved salt into a plate of soil. Place this plate in a well-ventilated area to allow the water to evaporate naturally and the soil to dry. Now, when we look closely at these soils, we find that small stones are covered with a white object like a frost. A closer look at them with a magnifying glass reveals that these objects are larger ones