如果没有结晶形成，可以用玻璃棒刮一下烧瓶的瓶壁以诱导结晶形成。
If no crystals form, scratch the sides of the flask with a glass rod in order to induce crystallization.
现行的用于蒸馏和化学反应的烧瓶类玻璃仪器，有园底烧瓶、两颈瓶、三颈瓶等。
Currently, the apparatus used in distillation and other chemical reactions include round bottom flask, two necked bottle, three necked bottle, and etc.
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