The reaction proceeds more smoothly if the round-bottom flask is shielded from draughts by being placed in an empty beaker . 如果圆底烧瓶置于空烧杯中，则可屏蔽气流使反应进行平稳。
2.
This method involves freezing the protein solution on the walls of a round bottomed flask and sublimating the liquid in a vacuum . 这个方法包括将蛋白质溶液在圆底烧瓶的瓶壁上冰冻，和在真空中让液体升华。
