The Liskov Substitution Principle is a fundamental concept in object-oriented programming, ensuring that derived classes can be used in place of their base classes without altering the correctness of the program.

Efficiency in farming should never come at the cost of biodiversity.

The beauty of computational theory lies in its ability to abstract and generalize, turning specific problems into universal solutions.

If you lose or forget to bring a cable，adapter or charger，check with your hotel. Most hotels now have a drawer full of cables，adapters and chargers others have left behind，and probably have the one you are missing. You can often claim it after borrowing it.

译文：过去的时间逝去了不可追回，今天的日子也会在转瞬之间过去。赏析：已经过去的就让它过去，不必再追悔。我们要活在当下，珍惜每一天。与其用泪水悔恨昨天，不如用汗水拼搏今天。

When in doubt, tell the truth.