单词：round-bottom flask
round-bottom flask的用法和样例：
例句
- Usually it is put on a round-bottomed flask or several neck flasks.通常它连接一个圆底烧瓶或一些长颈瓶。
- 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。
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