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-- He has nothing to do, so he is wandering along the street.
impulse n.冲动(=a sudden wish to do sth)
on impulse 冲动的
-- He rushed out to catch up with the lady on impulse.
Be driven by impulse to do sth 情不自禁的做某事
-- I was driven by impulse to do it like this.
Impulsive adj.冲动的
Impulsively adv.冲动的, 有推动力地
dozen n.12个, 一打(=a group of twelve)
by the dozen 成打的
-- We usually buy eggs by the dozen.
dozens of… 许多的…
-- Dozens of students went to the cinema.