Activity records are child records of the Task record, just as the Tasks are child records of the Issue.

活动记录是任务记录的子记录，正如任务记录是问题的子记录一样。

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By saying nothing more than acts_as_tree in your ActiveRecord model, you can dynamically add methods to manage the tree, such as methods that retrieve the parent record or child record.

通过使用ActiveRecord模型中的acts_as _ tree，可以动态地添加方法来管理树，比如检索父记录或子记录的方法。

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This tale of a single rescued child hints at some of the reasons for Finland's amazing record of education success.

这个关于一名获救儿童的故事暗示了芬兰在教育方面取得惊人成绩的一些原因。

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Kindergartens, like the one my daughter attends, require parents to record their child's body temperature in a special notebook each morning.

BBC: Sars legacy still felt in Hong Kong, 10 years on

High-mortality Liberia actually saw impressive GDP increases whereas Senegal, whose record in child mortality is second to none, had a rather anaemic growth rate by recent African standards (3.8% a year, half that of Rwanda).

ECONOMIST: African child mortality

Perhaps even more important, the government previously didn't have any official record of a child's birth or death in rural Ethiopia.

WSJ: Bill Gates on the Importance of Measurement