Open core software is proprietary software built on top of open source software.

开源内核软件是以开源软件为基础构建的闭源软件。

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Of course, at its core, software development is a human activity.

当然，从本质上来说，软件开发是一种人类行为。

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Of course, at its core, software development is a human activity.

当然，从本质上来说，软件开发是一种人类行为。

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