The very essence of the creative is its novelty, and hence we have no standard by which to judge it.
创造性的本质在于它的新颖性，因此我们没有标准来评判它。
In international trade, a country should specialize in the production of goods for which it has a comparative advantage, and trade with other nations to maximize overall economic welfare.
The balance between energy needs and environmental protection is the challenge of our time.
