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When we analyze and understand these great changes, we must keep in touch with the changes in China, keep pace with the times, keep learning and making progress, and seize the opportunities of the times to adapt to the rapidly changing society.The change of the motherland is earth-shaking. It has gone through 70 years of ups and downs. After 70 years of hard work, our motherland stands proudly in the east of the world. The people of China are enjoying unprecedented peace and prosperity. The transformation of the motherland is like a magnificent epic, and every chapter is full of wonderful stories.

In terms of the time focus of the last century in the world, researchers hold a variety of perspectives. To sum up, it should refer to the comparison of changes between the last century and this century, and to learn new things by reviewing the old ones. This time interval also includes the changes in the new Millennium.When we analyze and understand these great changes, we must keep in touch with the changes in China, keep pace with the times, keep learning and making progress, and seize the opportunities of the times to adapt to the rapidly changing society.

In terms of the time focus of the last century in the world, researchers hold a variety of perspectives. To sum up, it should refer to the comparison of changes between the last century and this century, and to learn new things by reviewing the old ones. This time interval also includes the changes in the new Millennium.Some people observe from a longer-term perspective, such as the 400-year changes since the Westphalia system, others mainly focus on the changes after the founding of New China, and so on. Different perspectives, different analysis focuses, and different conclusions are drawn, but: one thing is consistent, and our era is undergoing a historic and tremendous change.