求翻译：根据全国生态功能区划，项目区属于鄂尔多斯高原东部典型草原防风固沙三级功能区，但不属于重要生态功能区；是什么意思？

According to the national ecological function zoning, project area belong to the Eastern Ordos Plateau steppe sand-fixing three-Ribbon, but does not belong to an important ecological function area;