It's an idiom in China, and its pinyin is bùjuérúlǐ, which is endless. It means that there is only one thin thread connected, which seems to be broken. The voice is subtle and long, indicating that things are extremely critical, and later it indicates that there are few heirs in skills and other aspects. From Liu Zongyuan's Letter to Xu Hemeng: "So the importance of inheritance is endless."

Usage:

As predicate and attribute; Used of sounds, letters, emotions, etc. It also describes a weak and long voice.

Use example:

Stone "Red Cliff Fu": "The lingering sound is endless."

Liu Tang Zongyuan's letter to Xu and Meng: "So, it is important to inherit; Endless. "