当你坐在窗明几净的教室中时, 仔细观察,可发现很多用玻璃制成的用品:窗玻璃、墨水瓶、电灯泡(管) 以及某些同学戴的眼镜等等.当你进入化学实验室,用的烧杯、烧瓶、试管等等也是由玻璃制成.至于家庭中则有更多的玻 When you are sitting in a clear-looking classroom, you can find many things made of glass: windows, ink bottles, light bulbs (tubes), glasses worn by some classmates, etc. When you enter the chemistry lab, The beakers, flasks, test tubes, etc. used are also made of glass. As far as the family is concerned, there are more glass