Russian ⇄ English

докладчик начал морализировать на тему того, как себя правильно вести, и слушатели вскоре утратили интерес stresses
Makarov.	the speaker began moralizing about the right way for people to behave, and his listeners soon lost interest; the speaker began moralizing on the right way for people to behave, and his listeners soon lost interest