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enter image description here

I got some warnings like this, but the display of my PDF seems ok, nothing wrong can be found in the report, I wonder what the problems are? I've read some answers here but still no idea, can anyone help me? Many thanks.

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    you have not really shown any information that will allow anyone to help you , but some of these must be clearly visible, the paragraph starting at line 755 of the source has a line sticking 33pt so almost half an inch or a centimetre or so into the right margin Aug 26, 2019 at 15:50
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    You should load package showframe (or, if you use geometry, add the option showframe) to visually check.
    – Bernard
    Aug 26, 2019 at 15:51
  • Thank you, I've just solved it.
    – Cecilia
    Aug 26, 2019 at 16:22
  • You can also look at tex.stackexchange.com/questions/21139/…
    – Rmano
    Aug 26, 2019 at 18:52

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LaTeX (TeX, really) is very picky. A \vbox is a vertical object, something like a page, if it complains it means it came up short to exactly fill the space or is too large. Ditto por \hbox, a horizontal object typically a line.

If the problems are smallish (and not visible), you can ignore them. Often minor margin overruns can be fixed by rearranging a paragraph, use different wording, or such. The vertical complaints are often due to asking to place a figure or table where it doesn't fit, or asking for pages of the exact same length.

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