At the highest level of abstraction, we can view the system as a single entity (complex whole), or black box.

在抽象的最高级别上，我们可以将系统视作一个单个实体(复杂整体)，或黑盒。

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The Context level treats the entire system as a single entity: a black box.

环境级别将整个系统视为一个单一的实体：黑盒子。

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Some teams also need to do system-level testing, so they organize their longer end-to-end tests into a single test plan folder.

有些团队还需要进行系统级的测试，所以他们将端对端测试组织到一个测试计划文件夹中。

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The Queen's speech is likely to propose an end to the multiple-tier appeal system for asylum seekers, replacing it with a single level of adjudication.

BBC: Call for radical asylum changes