As the number of services grows, tracking all these dependencies and evaluating the impacts of changes becomes a difficult task.

随着服务的数量增加，跟踪所有这些依赖关系并评估变更影响会变得越来越困难。

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Though many of its classes and services, like progress tracking, require a paid membership, some are free.

虽然许多班级和服务，比如进展跟踪等是需要会员付费的，但仍有很多项目免费。

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Versioning of services requires a mechanism for change tracking and providing visibility into service modifications.

服务的版本化需要通过某种机制跟踪并说明服务的更改。

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AeroVironment hopes to generate sales not just from services like the Army and Air Force, but also from the Central Intelligence Agency, the Department of Homeland Security (for help with border control) and weather services (for storm tracking and disaster recovery).

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The rise of video sites and streaming services have made tracking the popularity of a song much more complicated.

BBC: Charts seek to stay on top after 60 years

If tracking services are not used carefully and within the bounds of privacy laws, legitimate owners and security professionals can get into legal gray areas, the repercussions of which could be far more expensive than a replacement iPhone.

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