This is the 7447th most frequent Russian word.
гуолян
The word "гуолян" does not appear to be a standard Russian word. It might be a misspelling or a non-standard/local term.
In this case, "гуолян" refers to "Guoliang", a specific village or cultural reference.
Гуолян является выражением интересной культуры Китая.
Guoliang is an expression of China's interesting culture.
Here, "гуолян" refers directly to the name of the village as a geographical and historical entity.
Студенты изучали историю постройки деревни Гуолян.
The students studied the history of the construction of Guoliang village.
In this sentence, "гуолян" pertains to the village associated with the famous tunnel, emphasizing its touristic and cinematic interest.