学历证书所要求得学习时间比获得学位证书的时间短。
A certificate offers a shorter course of study than a degree.
一种儿童综合症，特征是易冲动，过度好动及注意力集中时间短，常导致学习障碍和许多行为问题。
A childhood syndrome characterized by impulsiveness, hyperactivity, and short attention span, which often leads to learning disabilities and various behavioral problems.
治疗时间短，不影响正常的工作和学习。
Take a shot time to treat, do not influence normal working and studying.
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