【参考译文】
1. Only through the analysis and study of the phenomenon can human understand the nature of the fact, therefore, science is needed.
2. The population pressure on land and land resources is growing rapidly, which is the most important one among all the major world problems we are facing.
3. Suffering from so many setbacks and failures, he has become wiser and can finish this task well.
4. People will neither exist nor can production proceed without agriculture. Therefore, as the basis of the national economy, we must pay more attention to the agriculture.
5. The occurrence of this matter is caused by your carelessness, not by our fault.
