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.

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