Nuclear energy: used in war can kill people, but also benefit mankind, such as power generation weapons, can defend the country or be used for aggression. Who can punt and capsize; A blessing in disguise is a blessing in disguise; The extremes of things must be reversed, and the extremes of joy must be reversed; Misfortune depends on happiness, and happiness depends on misfortune; For example: for example, moderate sunlight can promote plant growth, and once it lasts for a long time, it will cause drought; Cao Cao acted cautiously, so he became a hegemon. However, it is precisely according to this feature that Kong Ming made him fall into the trap repeatedly. Kongming devoted himself to the Northern Expedition many times, trying to help the Han Dynasty. His patriotism is strong, but it is precisely because of this that he fought militarily, making Shu poor and weak. ...