## 3 Results
### Visual Analysis  
Firstly, the co-word matrix table was converted to a UCINET-readable format [38], and then the network density, degree centrality, and K-Core were converted [5; 36; 37], thereby presenting nodes and clusters with different appearances. The bigger and more central the nodes are, the more important they are. The density of the network diagram for China was 0.501, which means that 50.1% of the possible links actually appeared. Figure 4 also shows that there are six clusters in the network diagram. Cluster 1 (square, K-Core 10) takes social \begin{table}
\begin{tabular}{c c c c c c c c c c} \hline
**China** & **A.** & **B.** & **C.** & **D.** & **E.** & **Taiwan** & **A.** & **B.** & **C.** & **D.** & **E.** \\ \hline A. sports & 0 & 419 & 168 & 93 & 149 & A. training & 0 & 70 & 45 & 52 & 80 \\ B. exercises & 419 & 0 & 378 & 20 & 394 & B. action & 70 & 0 & 42 & 37 & 69 \\ C. training & 168 & 378 & 0 & 15 & 174 & C. body & 45 & 42 & 0 & 25 & 27 \\ D. martial arts & 93 & 20 & 15 & 0 & 1 & D. muscle & 52 & 37 & 25 & 0 & 23 \\ E. athlete & 149 & 394 & 174 & 1 & 0 & E. player & 80 & 69 & 27 & 23 & 0 \\ \hline \end{tabular}
\end{table} 
Table 4: Co-word matrix table. \begin{table}
\begin{tabular}{c c c c c c c c} \hline
**Region** & **Ranking** & **Word** & **Word** & **Co-Occurrence** & **Ranking** & **Word** & **Word** & **Co-Occurrence** \\ \hline \multirow{5}{*}{China} & 1 & sports & development & 782 & 11 & exercises & standard & 318 \\ \cline{2-8}  & 2 & sports & society & 716 & 12 & sports & system & 302 \\ \cline{2-8}  & 3 & development & society & 439 & 13 & exercises & development & 291 \\ \cline{2-8}  & 4 & sports & theory & 427 & 14 & development & theory & 289 \\ \cline{2-8}  & 5 & sports & exercises & 419 & 15 & theory & society & 245 \\ \cline{2-8}  & 6 & sports & China & 415 & 16 & culture & development & 237 \\ \cline{2-8}  & 7 & exercises & athlete & 394 & 17 & China & society & 233 \\ \cline{2-8}  & 8 & exercises & training & 378 & 18 & sports & cityity & 231 \\ \cline{2-8}  & 9 & China & development & 327 & 19 & sports & service & 225 \\ \cline{2-8}  & 10 & sports & culture & 325 & 19 & sports & organization & 225 \\ \hline \multirow{5}{*}{ Taiwan} & 1 & exercises & performance & 193 & 11 & exercises & development & 111 \\ \cline{2-8}  & 2 & training & exercises & 163 & 12 & exercises & ability & 109 \\ \cline{2-8}  & 3 & player & exercises & 151 & 13 & exercises & factor & 107 \\ \cline{2-8}  & 4 & exercises & athlete & 137 & 14 & training & performance & 98 \\ \cline{2-8}  & 5 & body & sports & 132 & 15 & exercises & 'index & 97 \\ \cline{2-8}  & 6 & exercises & effect & 123 & 16 & exercises & scale & 86 \\ \cline{2-8}  & 7 & action & exercises & 121 & 16 & exercises & Taiwan & 86 \\ \cline{2-8}  & 8 & exercises & activity & 120 & 18 & muscle & exercises & 85 \\ \cline{2-8}  & 9 & exercises & model & 116 & 18 & exercises & society & 85 \\ \cline{2-8}  & 10 & exercises & health & 112 & 20 & action & performance & 82 \\ \hline \end{tabular}
\end{table} 
Table 3: Statistics of co-occurrence times. sports development as the main core, has the most nodes, is in the center of the overall structure, and occupies the largest area, which can be said to be the trend of sports research in China. Cluster 2 (diamond, K-Core 9) only has behavior nodes, but it is located at the center point directly below the overall structure diagram, showing that various sports behavior issues have also received attention. Cluster 3 (regular triangle, K-Core 8) has three nodes, which are close to the left side of the network diagram, indicating that sports public policy and other research accounts make up a considerable proportion. Cluster 4 (round, K-Core 7) only has the node of teenager, suggesting a focus on research at the teenager level, e.g., teenager sports activities, teenager physicality, mental health, etc. Cluster 5 (inverted triangle, K-Core 5) is directly on the top of the network diagram, including research on rats and martial arts, which is less than the first four clusters.