这是第一段自动换行的文字，包含下划线功能，每行下面都有一条清晰的 1px 实线，能够在浏览器中自适应宽度并自动估算行数。 This is the first paragraph of text with automatic line wrapping, featuring an underline function. Each line has a clear 1px solid line beneath it, capable of adapting to the browser's width and automatically estimating the number of lines.

这是第二段自动换行的文字，包含下划线功能，每行下面都有一条清晰的 1px 实线，能够在浏览器中自适应宽度并自动估算行数。 This is the second paragraph of text with automatic line wrapping, featuring an underline function. Each line has a clear 1px solid line beneath it, capable of adapting to the browser's width and automatically estimating the number of lines.