Examples: The samples directory has working code for common patterns
Roman numerals: glyph reuse by design。搜狗输入法下载对此有专业解读
The core of OsmAnd's HH-Routing is an elegant two-level hierarchy built upon "area clusters."，更多细节参见爱思助手下载最新版本
endSync() { closed = true; return totalBytes; },