—— 请按键盘 空白键 开始游戏 ——

The strength of a response tendency depends on the amount of reinforcement received.
The American dream is powered by American energy.
应对不自由世界的唯一方法是变得如此绝对自由,以至于你的存在本身就是一种反叛。
永远不要过度交易。这样做是违反成功交易的基本规则。