在常温常压下，纯净的水是一种无色、透明、无嗅、无味的液体，它看得见，摸得着，但是抓不住。它小则成溪，大则成江河；它受一定的表面张力的作用，但不具有一定的形状；它不象冰那样坚硬，也不像气那样虚无缥缈；让人感觉不到它的存在，却又须臾不可缺少。生命，是地球上有 At room temperature and pressure, pure water is a colorless, transparent, odorless, odorless liquid, it is visible, touching, but could not catch. It is as small as a river, as a large river; it is subject to a certain degree of surface tension, but does not have a certain shape; it is not as hard as ice, nor gas as vague; people do not feel its existence, But indispensable Life is on earth