介绍了造成岩石地球化学不均匀性的原因，主要有测量误差、闭合问题及岩石学方面的控制等。
Many altered rocks in hydrothermal deposit have multiple precursors. The lithogeochemical heterogeneity in rocks are mainly due to measurement error, closure and petrological controls.
是一个闭合的问题，当然，它被设计成想得到是或否的结果。
Is a closed question, and of course, it's designed to ferret out a yes or no.
当指定Z为复数变元时，就有了形式幂级数的“变换”函数，即闭合形式的问题。
When Z is assigned the meaning of a complex variable, problem of "closed form" of formal power series emerges.
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