Students score one ring around a glass bottle with a cutter. Then hot water and cold water, over and over, until the glass breaks cleanly along the line.同學用玻璃切割器在瓶身上劃一圈，接著冷熱水交替，讓玻璃沿著刻痕整齊斷開。
We start with an empty glass bottle.我們從一個空玻璃瓶開始。
Glass is hard, so we are careful.玻璃很硬，所以我們要小心。
The cutter cuts one line around the bottle.切割器在瓶身上劃一圈。
The teacher pours the water slowly.老師慢慢地把水倒下去。
First we use hot water.我們先用熱水。
Then we use cold water.接著換冷水。
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