HSK 4 · VERSION 2.0#47
Expressing “Lies In” with “zàiyú”
在于
How it works
在于 (zàiyú) means “to lie in.” It is used to explain the key reason, main point, or essential cause of something.
The pattern
A + 在于 (zàiyú) + B
Example sentences
问题的关键在于方法。
The key to the problem lies in the method.
成功在于坚持。
Success lies in persistence.
这件事的重要性在于它的影响。
The importance of this matter lies in its influence.
Key point
This expression is formal and often used in explanation or argument.