如果是一个有很多内部调出到其他包含并行状态的杂乱系统，那你需要在并行实现前先做一些清理。
If it is a gnarly mess with lots of internal callouts to other systems to maintain parallel state changes, then you have some cleanup to do before trying a parallel implementation.
城市杂乱无序的拓展地区导致绿地减少，增加了交通系统的压力，使得商人和地产开发商难以找到商业用地和住房用地。
Unplanned sprawl leads to a shortage of green space, strains transport systems, and makes it hard for businesses or housing developers to find sites.
而且它安装的Android系统很干净，没有附加那些把系统搞得一团糟的运营商或者制造商开发的杂乱软件。
And it's a clean install of Android with no messy additional carrier or OEM software to muck everything up.
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