Please write a passage whose theme is "wisdom of teaching and research under the 'double reduction policy'". The passage should be about 600 words and be clear, elegant, graceful. And it should include classic actual examples about practices in "double reduction policy" and classic words of wisdom about education or teaching. To put a hint here, the "double reduction policy", as you may also know,  is a policy in China aimed at easing the burden of excessive homework and off-campus training for students. So in writing this passage, I want you to refer to the relevant information in China websites.