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1.language learning 语言学习
In the course of the English language learning, I have experienced the pleasure of study.
在学英语的过程中，我体验到了学习的快乐。
2.at random 胡乱的；随便的
We received several answers, and we picked one at random.
我们收到了一些答复，并从中随机挑选了一个。
3.deep sleep 深度睡眠
Una soon fell into a deep sleep.
尤娜很快便沉沉睡去。
4.centered on 集中于
Her research is centered on the social effects of unemployment.
她的研究课题是失业对社会的影响。
5.A new study suggests some language learning can take place during sleep.
take place 发生；举行
Elections were postponed the day before polling was due to take place.
在预定进行投票的前一天选举被延期。
Peace talks failed to take place because of a dispute over the venue.
由于在谈判地点上存在分歧，和平谈判未能举行。
6.During normal sleep, human brain cells are commonly active for a short period of time before they enter a state of brief inactivity, the researchers said.
for a short period of time 短暂的；短时间的
The quote should not be binding and only be valid for a short period of time.
报价不应该是固定的，应该只在短期内有效。
I've only been in Madrid for a short period of time so I don't know many people here.
我来马德里的时间还不长，在这儿认识的人也不多。
