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<!DOCTYPE html> <html> <head> <style> img { display: block; margin-left: auto; margin-right: auto; } </style> </head> <body> <h2>居中图像</h2> <p>要使图像居中，请将左右边距设置为自动，并将其制成块元素。</p> <img src="paris.jpg" alt="巴黎" style="width:40%"> </body> </html>