Pinyin: zhong1 yuan2 Definition: the central plains of China/the middle and lower regions of the Yellow river, including Henan, western Shandong, southern Shanxi and Hebei/a plain
Pinyin: zhong1 chang3 Definition: middle period of a tripartite provincial exam (in former times)/midfield/mid-court (in sports)/half-time/intermission half-way through a performance
Pinyin: Zhong1 shan1 Definition: refers to Dr Sun Yat-sen/Nakayama, common Japanese surname (borrowed by Sun Yat-sen)/Zhongshan prefecture level city in Guangdong close to Sun Yat-Sen's birth-place
Decomposition Levels: Level 1: Only divided once. So only two components. Level 2: Radical Decomposition. The character gets decomposed into its lowest radical components. For the complete list visit the Radical wikipedia page. Level 3: Graphical Decomposition. Shows all the strokes & lowest level of components that make up the character. If you see questions marks or too many "block" characters, especially when it comes to level 3 decomposition you might need the correct font.