在于
Pinyin: zàiyú
to rest with; to lie in; to be due to (a certain attribute)
Example sentence
电视的优点在于它给体育爱好者提供了更大的方便。
Diànshì de yōudiǎn zàiyú tā gěi tǐyù àihàozhě tígōng le gèng dà de fāngbiàn.
Television has the advantage of providing sports fans with greater convenience.
What 在于 means
在于 (zàiyú) is a Chinese word meaning “to rest with; to lie in; to be due to (a certain attribute)”. It appears in the HSK 5 collection.