The tears of the world are a constant quantity. For each one who begins to weep, somewhere else another stops. The same is true of the laugh.

教学应始终适应学生的发展阶段。

To lose a language is to lose a way of seeing the world.

模糊逻辑是一种通过让机器能够处理不确定性和不精确性来使其更加智能的方法。

翻译：待人宽厚能赢得人心，举止恭敬能让人舒适，与人相处多一份包容与尊重，路会越走越宽。

感觉不好也没关系。