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The Word Cloud Results to Analyze Research Hotspots of Every Years (2011 - 2020)

  • The merge word cloud of all central topics in 2011.

  • The merge word cloud of all central topics in 2012.

  • The merge word cloud of all central topics in 2013.

  • The merge word cloud of all central topics in 2014.

  • The merge word cloud of all central topics in 2015.

  • The merge word cloud of all central topics in 2016.

  • The merge word cloud of all central topics in 2017.

  • The merge word cloud of all central topics in 2018.

  • The merge word cloud of all central topics in 2019.

  • The merge word cloud of all central topics in 2020.