Latex row overflow problem overfull / hbox (1.1499pt too wide) in paragraph

Reference: http://en.wikibooks.org/wiki/LaTeX/Errors_and_Warnings#Overfull_hbox

Problem source: When writing latex source files, Overfull \hbox (1.1499 PT too wide) in paragraph often appears. When viewing the compiled PDF, we find that the line exceeds the boundary, so we need to solve it.

Solution: Find the corresponding prompt line, then cut off the last few words arbitrarily, then start another line.
Eg; I’m very powerful in computer.
Change to: I’m very happy
Powerful in computer.
Justification problem: Moving the last word on the line to the next line would make the Spaces in the line wider than the current limit.)

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