第二种情形，即变量的条件修改，是重新使用的问题的一个子集，只是有时我们会保持现有的值，有时需要使用一个新值。
The second case, the conditional modification of a variable, is a subset of the variable reuse problem except that sometimes we will keep our existing value and sometimes we will want a new value.
从数学上对三元配合物用于光度分析时适宜酸度范围问题的第二种情形进行了探讨，并给出了简便的计算公式。
The second optimum acidity range of spectrometric determination with ternary coordination compound was studied mathematically in this paper, a simple calculation method was also provided.
下面考虑第二种情形，你会注意到当第一次发送的消息被再次提交，则日志消息将会被处理2次，因为这条日志信息已经被记录了。
If you think through the second scenario, you notice that a logging message sent gets processed twice as it has already been logged when the logging message was submitted for the first time.
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