address | speak to

Address 是“向……讲话”的意思，是及物动词。例如：

Comrade Chen will address the meeting. 陈同志将在会上讲话。
He addressed his friend on this matter. 他对他的朋友讲了这件事。
He addressed the rally. 他在群众集会上讲了话。


如果address 的宾语不是人或人的集会，其意思就不是“讲话”，而是”写“或”提出“。例如：

I want to address a letter to my friend. 我想给我的朋友写一封信。
I addressed a question to him. 我向他提出一个问题。


Speak to 是“向……讲话”的意思。Speak at是“在……会上讲话”， speak about (on) 是“谈……问题”。例如：

I'll speak to him about the matter. 我要同他谈谈这件事。
He is going to speak at the meeting this afternoon. 他将在下午的会上讲话。
He is going to speak about the international situation. 他将谈谈国际形势。