So to speak, the study of task-based learning and teaching has reached a mature period.

可以说，任务型学习与教学的研究已进入了成熟阶段。

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Thus, it is a challenging task to study the new words of this period.

因此，研究这个时期的新词，就成了中古汉语词汇研究的一项极其重要的任务。

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Increase task duration, so the work is done over a longer period of time.

延长任务工期，使工作在更长时间内完成。

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Increase task duration, so the work is done over a longer period of time.

延长任务工期，使工作在更长时间内完成。

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