如果有三层以上，或者在一个异常超类中子类的个数超过了七个，那我打赌一定有什么地方出错了。
If you have more than three, or more than seven subclasses of a single exception superclass, my bet is that something is wrong.
理论上认为，储层含气使声波时差孔隙度和密度孔隙度增大，使中子孔隙度减少。
It is theoretically considered that reservoir gas-bearing makes interval transit time porosity and density porosity increase and neutron porosity decrease.
可以把铀做成棒状放在原子反应堆内，在铀棒的四周，围一层中子减速剂即节速剂。
The uranium may be put into the reactor in the shape of rods and the rods surrounded with a neutron-slower or moderator.
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