Everything in the world has a bottom line, and crossing the bottom line will lead to unexpected consequences. The asteroid that hit the earth 600,000 years ago must have crossed the bottom line of the survival of many species, resulting in the extinction of a large number of creatures. A little more carbon dioxide gas can better protect the atmosphere, but if it crosses the bottom line, it will have a greenhouse effect. There is still an invisible bottom line in people's hearts, which restricts people's behavior from time to time. The bottom line is the cornerstone of life, the lowest criterion of life, and the magic weapon for people to settle down and maintain their self-esteem. Please write an article of not less than 800 words on the topic of "Bottom Line". Below the bottom line is the abyss meteor shower across the sky, just like a silver snake, like a dream. However, exceeding the bottom line of the atmosphere will lead to the danger of hitting the earth. The waters of the Yangtze River are mighty and rushing down, which is spectacular. But beyond the bottom line of the river bed, it will become a flood, which will be out of control. People living on the earth are dancing gracefully on the edge of their own times. However, if you exceed your own ideological bottom line, you will be in rolling in the deep, beyond redemption. Looking back at the dust of history, it is not difficult to find that any ruler who wants to ride on the people's heads and bully the weak and fear the hard, and dance with a gun under the bottom line that the people can tolerate, can only bring his own destruction. Think about Ying Zheng, the king of Qin, who once "swallowed his ministers for two weeks, ruled Liuhe according to the supreme authority and whipped the world". How majestic and natural it was. However, after the establishment of the Qin Dynasty, they forgot the fundamentals of ruling the people, and turned to building new buildings, burning books and burying Confucianism, leaving the people in dire straits. Beyond the bottom line, how can the people not resist? The result can only be "one person can't kill seven temples", and the heyday of the Qin Dynasty only lasted for II and came to an end. Coincidentally, because Emperor Yang Di only knew pleasure, regardless of people's livelihood, the people couldn't stand it, and the flames of the uprising burned all over the place, and a huge Sui Dynasty ceased to exist in just a few years. Therefore, each of us should have such a bottom line in our hearts. We regard it as the criterion of life and the magic weapon to settle down. Faced with the darkness of the officialdom and the filth of the secular world, he resolutely took off his official clothes and chose to retire to the countryside. Listening to chickens barking and dogs barking, and watching mountains and fog, he felt that his heart had never been so clear and flawless. Tao Yuanming's bottom line is not to defile the official standard. He found his own clean sky in his heart. Throughout the ages, many people have been influenced by greed. During the Republic of China, Cao Kun once became a warlord for profit. Feng used to run around for the benefit and run for president; Zhang used to be an insatiable bandit, dominating the Northeast. However, in the face of threats and inducements from Japanese invaders, Cao Kun, Feng and Zhang did not give in. Wang Jingwei chose to cooperate with the Japanese to establish a puppet regime to serve the Japanese army. Cao Kun, Feng and Zhang kept the bottom line and avoided rolling in the deep, and history did not blame them for their perfection; Wang Ching-wei, on the other hand, gave up the bottom line of China people for his personal interests, betrayed his country, and inevitably left him with a thousand years of infamy, which was spurned by history. The kneeling posture of Mr. and Mrs. Wang is a trial of history! The wheel of history keeps moving forward, and the dawn of the new century shines on us. Going into the future, we can't forget history, let alone the bottom line of the soul. Let's take history as a mirror, keep our inner bottom line, stay away from that abyss and perform our wonderful life.