债务要么产生于契约，要么产生于侵权行为。
解析：菩提比喻智慧，明镜比喻清净心。本来清净，又哪里会染上什么尘埃？
The true discovery of America is before us. The true fulfillment of our spirit, of our people, of our mighty and immortal land is yet to come.
The true measure of a mining company isn't its stock price, but its stewardship.
The greatest glory in living lies not in never falling, but in rising every time we fall.
La verdadera poesía nace del dolor, pero también de la esperanza, de la lucha por encontrar un sentido a la existencia.
我不想孤单，我想被单独留下。
"The true value of a computer scientist lies in their ability to see the unseen and solve the unsolvable."