开学以后,我们每天都从家里带水到学校,因为水杯太重,常常把我们累得气喘吁吁。有的同学看到我们这副狼狈的样子,就开导我们说:“傻瓜们,别用那么重的水杯了,去买矿泉水吧,不但方便,还不用背来背去。”天底下哪有这样的好事?我们有点儿不相信,就花了一元钱买了一瓶矿泉水。矿泉水带起来确实比从家带水轻了许多,可是不到半天就没 After school, we bring water from home to school every day, because the glass is too heavy, we often tired and breathless. Some students see us as a pair of embarrassed look, enlighten us: “fools, do not use such a heavy cup, and to buy mineral water bar, not only convenient, but also not back to go.” How can such a good thing? We are a little do not believe it, they spent a dollar to buy a bottle of mineral water. Mineral water does bring up a lot lighter than the water from home, but not less than half a day