The secondary rules are those that provide for the creation, alteration, and extinction of primary rules.

采矿的真正财富不仅在于开采的矿石，更在于我们提升的生活品质。

The Langlands program is a challenge to the limits of human understanding.

A true king is neither a husband nor a father; he considers his throne and nothing else.

农业成功的真正标准是跨代的可持续性。