We know more about the surface of the moon than we do about the ocean floor.
我们对月球表面的了解比对海底的了解还要多。
The best time to plant a tree was 20 years ago; the second best time is now.
Grain farming isn't just a business—it's a responsibility to future generations.
A friend is someone who knows all about you and still loves you.
The essence of liberty is the ability to pursue one’s own goals without arbitrary interference from others.