作为丹佛道尔小学的一名新教师，凯尔·施瓦兹想到了一个简单的方法来了解她的三年级学生，他们大多来自贫困家庭。
As a new teacher at Doull Primary School in Denver, Kyle Schwartz thought of a simple way to get to know her third graders, most of whom came from poor families.
遗憾的是，对于何时应当放弃应用级事务并没有简单的规则。
Unfortunately there are no simple formulas for when to back away from application level transactions.
调度器的工作非常简单：它在优先级最高的队列中选择一个任务来执行。
The job of the scheduler is simple: choose the task on the highest priority list to execute.
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