物流系统可以划分为企业层次、区域层次、国家层次和国际层次来进行研究。
The logistics system can be researched at enterprise level, regional level, national level and international level.
数字流域是数字地球的一个重要区域层次，数字清江是数字流域建设在清江流域的具体实践。
Digital valley is an important regional level of digital earth and the digital Qingjiang is a practical project of digital valley construction.
大多数实时收集器工作在单个对象层次上，而 Garbage First则在区域层次上进行收集。
Whilst most real-time collectors work at the highly granular level of individual objects, Garbage First collects at the region level.
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