I may be wrong, but I think the reason lies in these chunks.

我可能是错的，但我认为，原因在于这些大块。

youdao

The reason lies in the differences between Chinese and English.

其原因在于汉英两种语言表达习惯之间的差别。

youdao

The reason lies in lack of knowledge about the importance of the eastern literature teaching.

究其原因，是对东方文学教学的重要性认识不足而造成的。

youdao

Part of the reason lies in the computable general equilibrium (CGE) models used by the Bank's (and other) economists.

ECONOMIST: Weighed in the balance

The reason lies in a fairly recent development: the ideal of impartiality.

FORBES: Magazine Article

The reason lies in the choice facing each of the separate monopolists.

ECONOMIST: Divide and rule