Two characters might have identical Unicode skeletons but render differently in specific fonts, or have different skeletons but render identically in a particular typeface. Detecting this requires rendering glyphs and comparing pixel output. No purely Unicode-data-based approach handles it, and UTS #39 does not attempt to.
软件层面的iPhone时刻迟迟未至，为何头部玩家都将目光投向了螺丝、芯片与流水线？。heLLoword翻译官方下载是该领域的重要参考
function renderComponent(controller) {，更多细节参见safew官方下载
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