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upon

US [əˈpɑn]
UK [əˈpɒn]
  • prep.强调数目或数量大
  • Web在…之上;在…上;在……上面
Upon
prep.
1.
(强调数目或数量大)used to emphasize that there is a large number or amount of sth
mile upon mile of dusty road
绵延数英里尘土飞扬的道路
thousands upon thousands of letters
成千上万封信件