通过阅读这本书和做进一步的研究，我得到最后一点我已经知道但无法真正系统阐述的观点。
The final point that really hit on me from reading this book anddoing further research was one that I already knew but couldn’t reallyarticulate.
仍然可以继续通过，共存曲线来，反复提纯B物质，挥发性低的物质，最后可以得到一点量。
You can continue to walk your way down through these coexistence curves and purify repeatedly the component B, the less volatile of them, and end up with some amount of it.
这一点可以通过在最后一行上调用assert语句进行验证。
You can verify this by calling the assert statement on the last line.
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