法律的概念涉及主要规则和次要规则的结合。
The concept of law involves the union of primary and secondary rules.
解释：不注意天时，财富就不能增长；不注意地利，粮食就不会充足。
I sent my Soul through the Invisible, Some letter of that After-life to spell: And by and by my Soul return'd to me, And answer'd "I Myself am Heav'n and Hell."
The past is a shadow that follows us everywhere.
统治阶级掌握着物质生产的手段；无产阶级仅有的是他们的劳动力。