吵闹

图书馆里不许大声吵闹。

tú shū guǎn lǐ bù xǔ dà shēng chǎo nào.

In the library, it is not allowed to make loud noises.

老师神情严肃地走进教室的一瞬间，原本吵闹的班级顿时变得鸦雀无声。

lǎo shī shén qíng yán sù dì zǒu jìn jiào shì de yī shùn jiān, yuán běn chǎo nào de bān jí dùn shí biàn dé yā què wú shēng.

The moment the teacher walked into the classroom with a serious look, the originally noisy class suddenly became silent.