因此，对于多层“同心”容器内的测试，nose会在运行测试之前运行所有容器中的setup代码，在运行测试之后运行所有容器中的teardown代码。

For nose, therefore, a test lives inside of not one but a series of concentric containers, any of which can contain setup code that gets run before the test and teardown code that gets run afterward.

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管状嵴的线粒体、多层同心环状的滑面内质网以及高尔基体较为常见。

The mitochondria with tubular cristae, multilayer concentric circular smooth endoplasmic reticulum, and golgi complexes are often observed.

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块根在发育的初期具有类似“年轮纹路”的多层同心圆结构，当年产生，当年充实。

Its root tuber has multilayer concentric circularity similar to "annual ring lines" at the initial stages of development, and grows and enriches at the same year.

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