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1·She was nominated to speak on our behalf.

她被指派代表我们发言。《牛津词典》

2·She was billed to speak on 'China—Yesterday and Today'.

据宣传她要发表题为“中国—昨天和今天”的演讲。《牛津词典》

3·British people seldom speak on the train, or the bus.

英国人很少在火车上或公共汽车上说话。

4·If you're a person who uses pet phrases when you speak, you should train yourself carefully not to use these when you speak on the phone.

如果你是一个平常说话喜欢带口头禅的人，你就要训练自己小心地避免在接听电话时使用这些。

5·They are best qualified to speak on this question.

他们对这个问题最有发言权。《新英汉大辞典》

6·I heard him speak on HIV and I invited him here.

我听他谈论艾滋病毒问题并邀请他来此。

7·Usually it's a pleasure to speak on such an occasion.

通常，在这样的场合下谈话很有一番乐趣。

8·Think and speak on verified, proven information and data.

根据经过确认和证明的信息和数据讨论问题。

9·The new device would allow them freedom to speak on their own.

新装置将让他们自由说话。

10·The two rarely speak on the phone, but they do send each other long emails.

她们两个几乎不通电话，但她们的确互相发送长长的电子邮件。