第3期给大家介绍 RUN 系列：
run across (meet by chance)
run after (chase; pursue)
run against (clash; compete against)
example: John Kerry ran against George W. Bush in the last U.S. presidential campaign.
run away (escape, flee)
run into (meet by chance; encounter)
example: Should you run into any trouble, don't hesitate to contact me. (朋友听到这话一定很高兴~)
run off (flee; drain away)
run out (use up, exhaust)
example: Hurry up! We are running out of time.
run over (travel over; read quickly; go beyond a limit)
example: The child was run over by a car and was in critical condition.
run short of (become insufficient or scant in supply)
example: It seems that China is running short of gas due to surging domestic consumption needs.
run up against (encounter)
run wild (get out of control)
作业：请大家写下词组的中文解释^_^