—— 请按键盘 空白键 开始游戏 ——

Natural experiments can provide valuable insights into economic questions.
My stomach is a knot of sorrow and anger, but I keep smiling.
跨行业的合作至关重要。没有任何一家公司或行业能够单独解决水产养殖的挑战。
In the state of nature, profit is the measure of right.