[ti:] [ar:] [al:] [by:听力课堂网～www.prnkuo.cn] [00:04]boundary [00:05]Psychologists tell us boundaries are healthy…. But few boundaries remain. [00:13]frontier [00:16]We may use robots to expand our frontiers, first through their ability to [00:21]withstand environments, harmful to ourselves. [00:29]margin [00:30]You shouldn't have written in the margin since the book belongs to the library. [00:40]interval [00:41]It may be necessary to stop at intervals in the learning process [00:46]and go back to the difficult points in the lessons. [00:52]bounce [00:53]A suburban Chicago car dealer for more than 30 years, [00:57]Jack Phelan says the business has never been worse, but it will bounce back. [01:06]leap [01:08]The toy industry has witnessed great leaps in technology in recent years. [01:15]spring [01:19]As the old empires were broken up and new states were formed, [01:24]new official tongues began to spring up at an increasing rate. [01:33]pattern [01:35]While U.S. diet is relatively identical, water [01:39]supplies vary. The differences result from weather [01:43]patterns.

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