它们来源于经过时间考验过的观念，由实际生活中的例子作支持。

They are based on time-proven concepts supported by examples from real life.

youdao

它们来源于经过时间考验过的观念，由实际生活中的例子作支持。

They are based on time-proven concepts supported by examples from real life.

youdao