We need to generate article content starting from the first chapter heading (##). Must include Chinese content, 300-800 words. Must insert 3-4 image placeholders. Must not use Markdown image syntax but use HTML comment format. The guidelines for image insertion are that we need to insert comments with image prompt: … etc. The example shows we should output something like

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.nnWe must follow placement rules: first or second paragraph after opening must insert first image placeholder. Then mid article second image. Then before conclusion third image. Avoid lists or code blocks. Also no decoration.nnWe need to carefully place paragraphs and images.nnWe need at least three placeholders. Could choose up to 4. But guidelines say 3-4. I can insert three.nnThe article title is

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