// 复制剩余元素（只需复制左数组剩余，右数组已在原位置）
/etc is also writable, but it’s managed a bit differently. OSTree uses a technique called “etc overlay” to handle modifications in /etc. When an update is applied, OSTree compares files in the new version with those in /etc and applies changes intelligently, preserving local modifications as much as possible.，详情可参考服务器推荐
A simpler API would mean fewer concepts, fewer interactions between concepts, and fewer edge cases to get right resulting in more confidence that implementations actually behave consistently.，推荐阅读同城约会获取更多信息
Thomas Dohmke ex CEO, GitHub