追踪和过滤。
针对某个数据库单独开发的工具有着与电子表格软件相同的一些优点，此外它们还在过滤和可追踪性方面性能优异。
A homegrown tool based on a database has some of the same advantages as a spreadsheet; plus, they are often pretty good for doing filtering and traceability.
然而Word文档不能帮你排序和过滤大型的需求列表，也不能建立可追踪性。
However, Word documents cannot help you sort and filter large requirements lists or establish traceability.
天文学家借助哈勃太空望远镜的光学过滤器，可以准确查明该星云的化学组成、温度和密度，并追踪恒星的死亡过程。
Optical filters in the space telescope allowed astronomers to precisely determine the nebula's chemical makeup, temperature, and density, and to trace the stages of the star's demise.
天文学家借助哈勃太空望远镜的光学过滤器，可以准确查明该星云的化学组成、温度和密度，并追踪恒星的死亡过程。
Optical filters in the space telescope allowed astronomers to precisely determine the nebula's chemical makeup, temperature, and density, and to trace the stages of the star's demise.
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