Detailed and exact metadata is absolutely necessarily for the creation, the data loading, the data cleaning and regular maintenance of a data warehouse.
详细而准确的元数据对于数据仓库的创建、数据加载、运行维护、清理脏数据等工作都必不可少。
FUNDAMENTAL ASTRONOMY: a detailed study of the universe and its care and cleaning.
基础天文学：对宇宙的详细研究及其保养与清洁。
This report presented a detailed study on parameters and mechanisms of cleaning rubber layer from a tyre wording mould with pulse laser.
研究了运用脉冲激光清洗橡胶轮胎印字模具表面橡胶层的工艺参数与机理。
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