In our designs we should allow behavior to be extended without the need to modify existing code.
在我们的设计中，我们应该允许行为能够在不修改现有代码的情况下被扩展。
The design Engineer may use dimensions of existing non-nuclear designs as a starting point and then modify the designs if they do not meet code requirements.
设计工程师可以现有的非核设计为起点，然后遵照规范要求进行调整。
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