他用庄严的语气宣布了这个重要决定，现场立刻安静下来。

Tā yòng zhuāngyán de yǔqì xuānbù le zhè gè zhòngyào juédìng, xiànchǎng lìkè ānjìng xiàlái.

He announced the important decision in a solemn tone, and the venue immediately fell silent.