新中国在处理边界争端时始终遵循军事力量运用的三原则：底线原则、尚义原则、有限原则。

New China has been following the Three Principles of military force utilization in Dealing with boundary dispute: Bottom-line principle, justice-advocate principle and limitation principle.

并提出了松藻矿务局开采沉陷影响下的建筑物保护的三原则；其原则在实际中得到了有效的应用。

It has made out the "three rules" for protection of buildings, which has got effective application in Songzao.

在论述道德的三原则时，弗洛伊德涉及了人的本性问题，指出人的本性有趋乐避苦、趋利避害、利己排他的规定性。

When discussing these moral principles, Freud mentions of natural character of mankind and points out the man has the tendency of hedonism, utilitarianism and egoism.