China is a developing country with a relatively backward economy and culture. It is in a period of entrepreneurship. Even with the great development of the economy and the improvement of people's lives, we still need to maintain and carry forward the spirit of hard work and entrepreneurship. Carry out education on the spirit of hard work and entrepreneurship, guide people to correctly understand the national conditions, correctly understand the arduousness and long-term nature of building socialism with Chinese characteristics, firmly establish the thinking of building a country with frugality, and run the business with thrift, and vigorously carry forward the hard work, work hard, and understand difficulties. Progress, self-improvement. What is the main point of this passage? ['China is a developing country and is still in the entrepreneurial period.', 'Establish the idea of hard work and entrepreneurship across the entire nation.', 'Socialism is a difficult and long-term construction undertaking.', 'Hard work and entrepreneurship requires continuous education.']