public FengRichTextRenderer(ZhConverter zhConverter, StructuredExplanationRenderer explanationRenderer)
 {
     this.zc = zhConverter;
     this.explanationRenderer = explanationRenderer;
 }
 public ExtensionRichTextRenderer(ZhConverter zhConverter)
 {
     this.zc = zhConverter;
     this.explanationRenderer = new StructuredExplanationRenderer(zhConverter);
 }