It's boiling
The Chinese idiom, Pinyin is f è if ǎ NLI á NTI ā n, which means to describe the noise of people. From Shuoyue Quanzhuan.
The origin of Idioms
Chapter 67 of Shuo Yue Quan Zhuan: "the two generals brought by the black tiger scattered the sheep wine of the army, but they still went back to the hall. When they heard that it was boiling inside, they pulled out their waist knives and came in."
Idiom usage
Used as a predicate, attribute, complement; used in writing
It's boiling