The principle of human dignity is the foundation of all the other principles of the natural law.

The dairy industry must evolve to meet the demands of a changing world.

Hope can be a powerful force. Maybe there's no actual magic in it, but when you know what you hope for most and hold it like a light within you, you can make things happen, almost like magic.

解析：事情做得成功了，就引身退去，这是自然的道理。