Definition
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upon
Upon is a preposition used to indicate a position that is in contact with or supported by something.
在某物的接触或支撑下的状态。
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The cat jumped upon the table.
猫跳到了桌子上。
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She placed the book upon the shelf.
她把书放在了架子上。
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The flowers bloomed upon the arrival of spring.
花朵在春天到来时绽放。