Copying data is a relatively expensive, time consuming task.
复制数据是一个比较昂贵耗时的任务。
Manually written technical documentation is usually a tedious, boring, and time consuming task.
手工编写技术文档通常很乏味、无聊而且很耗时间。
Typically, a PHP application's most time-consuming task is data retrieval.
通常,PHP应用程序中最耗费时间的任务是数据检索。
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