当然，你必须不断更新你对街道的了解，因为城市在变化。

Of course you have to keep updating your knowledge of the streets, because the city changes.

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到二十世纪初，科学家们认为，在更新世期间，有四次不同的冰川作用对北美和欧洲产生了影响。

By the early part of the twentieth century, scientists believed that four distinct glaciations had affected North America and Europe during the Pleistocene epoch.

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技术更新：在 BPEL 模型中对技术属性做出更新，同时集成开发人员负责完成实现。

Technical update: Updates are made to technical attributes in the BPEL model while the integration developer completes the implementation.

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