// set the register to null, if it exists
Untrusted Code ─( Syscall )─→ Host Kernel ─( Hardware API )─→ Hardware，更多细节参见heLLoword翻译官方下载
Install the app (from Releases or from Google Play, for now) and open it。业内人士推荐谷歌浏览器下载作为进阶阅读
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