目录包含项目的最新发行版及其描述。

The catalog contains the latest releases of projects and their descriptions.

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附寄一本目录，上面有本公司系列产品中增添的最新型号E331。

We are also enclosing a catalog showing a brand new addition to our line, Model E331.

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目录统计信息的更新将为优化器提供最新的地图，以便在整个地形中快速定位。

Updating the catalog statistics would provide the optimizer with the most current map to navigate quickly through the terrain.

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