1 (wiktionary) 2 (zh.wikipedia) 3 (en.wikipedia) 4 (glosbe)

Compounds Expand your vocabulary by studying more complex words built by the 'core words'.

CORE WORDS

HSK 1.0 (1992)
Big5
Gb
Pin
Eng

B
於是

于是

yu2shi4

as a result/ thereupon

【◎Fix:◎於;◎于】于 in, on, at / go to / surname
是  是 indeed, yes, right / to be / demonstrative pronoun, this, that

HSK 2.0 (2010)
Big5
Gb
Pin
Eng

HSK 3.0 (2022)
Big5
Gb
Pin
Eng