Professor Wilson was invited to speak about the results of his research.

威尔逊教授获邀就自己的研究成果发言。

They have made a pact with each other not to speak about their differences in public.

他们彼此达成协议，不公开谈论他们的歧见。

The servants are not allowed to speak about me.

仆人们不允许谈到我。

I shall speak about it at the first opportunity.

我一有机会就讲。

I want to speak about how we apply these principles in practice.

我要谈谈我们在实践中是如何应用这些原则的。