The landscape pattern can be analyzed on three layers, corresponding landscape index is divided into three levels, namely the patch-level index, the class-level index and landscape-level index.
景观格局特征可以在三个层次上分析，相应地景观格局指数亦可分为三个水平，即缀块水平指数、缀块类型水平指数和景观水平指数。
Usually, they want management through the operating system level, including OS patch management, and often want managed security services as well.
通常，他们需要操作系统级的管理、包括操作系统补丁管理、他们还需要受管的安全服务。
The same version and patch level of a product can be used on servers throughout the world, thereby reducing the cost of support, maintenance, and training.
同一版本和补丁级别的产品能在世界范围的服务器上使用，因而降低了支持、维护和培训的费用。
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