I think it should be like this: reverse: analogy. Metaphor is to know many other things by analogy from one thing. Simplify: delete complex parts to make them concise. See the micro-knowledge: micro: tiny (weak); Author: obviously; Know: I know. You can know its development trend and the essence of the problem when you see a little sign, and you can also find problems from small things. Open source and reduce expenditure: develop water source and control water flow. Metaphor to increase revenue and reduce expenditure. Kill two birds with one stone: eagle: a fierce big bird. Refers to superb archery, kill two birds with one stone. Metaphor means doing one thing to achieve two goals. If a worker wants to do a good job, he must first sharpen his tools; if a craftsman wants to do a good job, he must first sharpen his tools. It is very important to prepare for a good job. I hope you are satisfied with my answer.