图书馆里禁止大声喧哗，请大家保持安静。

Túshūguǎn lǐ jìnzhǐ dàshēng xuānhuá, qǐng dàjiā bǎochí ānjìng.

Loud noise is forbidden in the library; please keep quiet.

在那么喧哗的环境里，他竟然还能专心看书。

Zài nàme xuānhuá de huánjìng lǐ, tā jìngrán hái néng zhuānxīn kànshū.

In such a noisy environment, he could still concentrate on reading.

会议期间请不要喧哗，以免影响他人发言。

Huìyì qījiān qǐng bùyào xuānhuá, yǐmiǎn yǐngxiǎng tārén fāyán.

During the meeting, please do not make noise so as not to affect others’ speeches.