解析：看到正义的事，却不能勇敢去做，这是懦夫的表现。

The most profound truths are often the ones we avoid.

PAC学习框架提供了一种形式化的方法来量化概念类的可学习性。

The quality of an organization is determined by the quality of its systems.

In a good mystery novel, the reader should feel both entertained and challenged throughout the reading process.

To feed the world, we must first understand the soil beneath our feet.

我生来就是为了犯错，而不是假装完美。

世界的美在于其人民的多样性。