Recebo 'Underfull \hbox (badness 10000) no parágrafo”, como corrigir?

Question

\section{Experience}
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    \twentyitem{2018-now}{PhD student, FWO-SB fellowship}{Ghent University}{The research mainly focused on the development of easy-read out nanofiber sensor networks and their implementation in food packaging. The second part of the research concerned the use of organic dyes in  novel polymeric light harvesting systems.}

    \twentyitem{2017-2018}{Research scientist}{VKC-Centexbel, Kortrijk}{The technological research and service centre for the plastics processing industry, is to support companies and organizations by means of research, testing and consultancy. During this period I improved my knowledge on processing and utilizing most of the commonly used polymers in various applications. Upon these polymers I gained field experience in SEM analysis, IR, DSC, TGA and mechanical characterization. As a consultant, I've acquired problem-solving skills to supply company specific solutions for my clients.}

    %\twentyitem{<dates>}{<title>}{<location>}{<description>}
\end{twenty}