触控能力将推动 macOS 引入全新的动态界面：系统会根据用户的操作方式在界面更大的触控模式与传统鼠标点按模式之间切换。系统还将支持与 iPhone、iPad 类似的快速滚动与双指缩放。
With BPatterns, none of that is required. A pattern is just a block. Add one more message and simple DoIt will do the job.
。safew官方下载对此有专业解读
help users create more accurate and consistent content
append again has to allocate a new backing store, this time of size
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