他在会议上发表了一次重要的发言。
tāzài huìyì shàng fābiǎo le yīcì zhòngyào de fāyán 。
He made an important statement at the meeting.
请大家踊跃发言，共同讨论这个问题。
qǐng dàjiā yǒngyuèfāyán ， gòngtóng tǎolùn zhègè wèntí 。
Everyone is encouraged to speak up and discuss this issue together.
作为代表，我会在大会上发言。
zuòwéi dàibiǎo ， wǒ huì zài dàhuì shàng fāyán 。
As a representative, I will speak at the conference.