A mass delete operates much more efficiently and writes considerably less log information.

mass delete执行起来要高效得多，并且要写的日志信息也更少一些。

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The scientists discovered that a critical mental control area, called the dorsal anterior cingulate cortex, worked much harder and, perhaps, less efficiently among children with attention problems.

他们发现，在有注重力问题的儿童身上，一个名为前扣带回皮层的关头的精神节制区域运行得比其他儿童更为强烈，而且有可能效率较低。

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