The mechanicalstirrer has been working for several hours.
这台机器搅拌器已连续工作好几小时了。
2
In a 250-cc. three-necked, round-bottomed flask provided with a mechanicalstirrer is placed 21.2g. (0.2 mole) of benzaldehyde , and 18.6 g. (0.2 mole) of aniline is added with rapid stirring.