It is the duty of a student to get everything out of a teacher, and the duty of a teacher to get everything out of a student.
Every challenge in business is an opportunity to innovate and improve.
科学家研究自然并非因为它有用;他研究它是因为他从中获得乐趣,而他从中获得乐趣是因为它是美丽的。
All happy families are alike; each unhappy family is unhappy in its own way.