Breaking long section titles in table of contents

Is it possible to t开发者_JS百科une LaTeX to break automatically long (sub-) section titles in the table of contents?

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You can manually set the title that appears in the TOC like this:

\section[Lorem ipsum]{Lorem ipsum dolor sit amet}

That way the "long title" appears on the section itself, and the "short title" appears in the TOC. I haven't tried it, but it might be possible to use the same number of words in the square brackets but insert manual line-breaks with \\.