My principle is to finish homework before playing games.
我的原則是先寫完作業再打電動。
Being honest is an important principle in life.
誠實是人生中很重要的原則。
The science teacher explained the principle of a lever.
理化老師講解了槓桿的原理。
Dad never borrows money from friends. That's one of his principles.
爸爸從不跟朋友借錢，這是他的原則之一。