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历史:
中考 高考 CET-4 CET-6 考研 BNC: 405 COCA: 693

upon

upon ˈpɑːn/ preposition
upon
ˈpɑːn/
preposition
Learner's definition of UPON
formal
: on
used to say that someone or something is very close or has arrived即将来临;近在咫尺
used to emphasize something that is repeated many times强调多次重复

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