One discovers his ignorance only through learning.

学然后知不足。

《新英汉大辞典》

The second kind of method is "through learning".

第二种学习的办法是“学而知之”。

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Happiness can be acquired through learning, although it is not our mother tongue.

幸福是可以通过学习来获得的，尽管它不是我们的母语。

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But if any schools do have to close, then the hope is to keep children learning for example, through phone calls or over the Internet.

VOA: special.2009.08.13

But what happens through learning is that another association develops that between the conditioned stimulus and the conditioned response.

但学习会在条件刺激与条件反应之间,建立起另一种联结。

耶鲁公开课 - 心理学导论课程节选

But I think one of the best ways to learn is through interactive learning,

但是我想最好的学习方法之一，就是互动教学，

要继续努力 - SpeakingMax英语口语达人

But it is still debated whether humans are born with an innate ability to process speech or whether this is something acquired through learning after birth.

BBC: Babies can hear syllables in the womb, says research

Such networks are already revolutionizing inventory control and fleet management, and are set to play a growing role in key social sectors like healthcare, through e-health applications, education, through remote learning and teacher training, and environmental management through applications like smart grids, monitoring systems and smart buildings.

UNESCO: MEDIA SERVICES

Aside from the lost income to the agency, the client also suffers a loss by needing to go through a learning curve with a new agency aside from the two to three months it typically takes to go through the process of a properly managed agency review.

FORBES: Calling An Agency Review? Top Three Reasons Why The CMO Should Be Part Of The Process From The Start