另一个小型支持函数仅仅从(伪)xpath表达式中解析出索引值，这里就不再重复了。

Another small support function simply parses out index values if they are given within a (pseudo -) XPath. I will not bother reproducing that here.

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分析结果表明，共晶结晶时硅之所以成为先析出相，铝硅合金之所以存在伪共晶，都有其热力学原因。

The results of analysis show that wty the silicon separatas out as a preliminary phase, and why the Al-Si alloys have their own pseudoeutectic structures are all for thermodynamical reasons.

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