There's also another human reason why it's difficult. Once you have bought a comprehensive self-study package, it requires enormous self-discipline to work through it.

另外还有一个在于人的原因：一旦你买了一整套自学材料，你就得做到严格自律，持之以恒，仔细研读它们。

youdao

There's also another human reason why it's difficult. Once you have bought a comprehensive self-study package, it requires enormous self-discipline to work through it.

另外还有一个在于人的原因：一旦你买了一整套自学材料，你就得做到严格自律，持之以恒，仔细研读它们。

youdao