New translations update-compatibility-level.md (Chinese Simplified)

Author: DBojsen

localizedContent/zh/content/how-tos/update-compatibility-level.md

@@ -24,6 +24,17 @@ applies_to:
 > [!WARNING]
 > 兼容级别升级是单向的。 你可以升级，但无法可靠地降级。 将其视为一次架构升级，并先验证你的部署目标。
 
+## Compatibility level vs. compatibility mode
+
+Compatibility Level and Compatibility Mode are separate properties that serve different purposes:
+
+| 属性                            | Controls                                                                                                               | Values                                                       |
+| ----------------------------- | ---------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------ |
+| `Database.CompatibilityLevel` | Which TOM features are available (e.g., custom calendars, DAX UDFs) | `1200`, `1500`, `1600`, `1701`, `1702`, etc. |
+| `Database.CompatibilityMode`  | Which platform the model targets, which TOM objects and properties are available, and which edition restrictions apply | `Unknown`, `AnalysisServices`, `PowerBI`, `Excel`            |
+
+If you need to change the platform target rather than unlock new TOM features, see [Change compatibility mode](xref:change-compatibility-mode).
+
 ## 何时升级
 
 在以下情况下升级：