If you're not improving, you're falling behind—especially in an industry as dynamic as animal husbandry.
插图不仅仅是装饰;它们是讲故事不可或缺的一部分。
国际体系的无政府性质迫使国家争夺权力。
The best way to predict the future is to invent it.
What do we call visible light? We call it color. But the colors are only the names we give to the way light behaves when it hits something.