背1遍就想上考场大学英语考研单词 804
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[by:听力课堂～www.tingclass.net]
[00:02]interval
[00:03]In fact, scientists are not sure how the brain tracks time.
[00:08]One theory holds that it has a cluster of cells specialized
[00:12]to count off intervals of time; another that a wide array of
[00:17]neural processes act as an internal clock.
