Challenge, this is a word that has been lingering in people's ears for thousands of years and makes people excited. For it, there is a warrior who flies a metal kite in the storm-Franklin; For it, there is an adventurer-Stephen who travels in the polar regions. In order to uncover the veil of nature layer by layer, human beings have challenged nature countless times with their tiny bodies. Gagarin became the first astronaut in the world-the first person to get rid of gravity completely; "Apollo 1" set foot on the land of the moon ... mankind constantly challenges the sky and strives to get rid of the gravity of the earth. From the Wright brothers who let people fly into the blue sky to the challenger landing on Mars, human beings are shouting the slogan "Man can conquer nature". The journey to the center of the earth declared the great ambition of human beings to go deep into the earth, although today's human beings are not so capable of going deep into the heart of this planet. However, Two Wan Li under the Sea shows human's fantasy and yearning for the sea, and human beings are fighting against the deep sea. Divers may be killed by water pressure every time they drop one meter. People are not satisfied with the submarine's dive, but use their own bodies to rush down the deep sea. Isn't that why a hero like Robert Mitchell appeared? Man is challenging the earth! Humans are challenging themselves as well as nature. There are many people in the world who challenge the Guinness World Record, and there are also many projects that challenge themselves, such as "blowing hot water bottles". Isn't this a great tribute to the spirit of challenge? Now the whole world is challenging, and so is China. Reform and opening up is a challenge, a large-scale challenge to the original concept. We firmly believe that we have also carried forward the fearless challenge spirit, and our nation stands among the nations of the world. I firmly believe that the "spirit of challenge" will accompany mankind endlessly on this planet, and only "challenge" can make the world better.