zhī suǒyǐ... guānjiàn zàiyú...
the key reason why... lies in... (之所以……关键在于……)
之所以 A，关键在于 B means “the key reason why A lies in B.” It highlights the decisive cause.
核心例句
他之所以进步这么快，关键在于每天坚持练习。
Tā zhī suǒyǐ jìnbù zhème kuài, guānjiàn zàiyú měi tiān jiānchí liànxí.
The key reason he improved so quickly lies in practicing every day.
HSK 6
HSK 6
1
1 个结构
15
15 个练习
课程摘要
之所以 A，关键在于 B means “the key reason why A lies in B.” It highlights the decisive cause.
之所以 introduces the result or phenomenon to be explained. 关键在于 introduces the core reason. Do not add 所以 after 之所以; this pattern already sets up an explanation. It is common in analysis and argumentation.
语法句型
之所以 A，关键在于 B
explains the decisive reason behind a result
他之所以进步这么快，关键在于每天坚持练习。
Tā zhī suǒyǐ jìnbù zhème kuài, guānjiàn zàiyú měi tiān jiānchí liànxí.
The key reason he improved so quickly lies in practicing every day.
