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I. stumble [ ˈstəmbəl, ˈstʌmb(ə)l] 动词 不及物动词

1. stumble (trip):

to stumble over/against sth

2. stumble (move unsteadily) + compl:

3. stumble (in speech):

II. stumble [ ˈstəmbəl, ˈstʌmb(ə)l] 名词

upon [ əˈpɑn, əˈpɒn] 介词

1. upon (on):

upon my word! veraltend
upon -ing
al +  infin

2. upon (indicating imminent or unexpected arrival):

3. upon (indicating large numbers):

在《PONS词典》中的词汇

stumble [ˈstʌmbl] 动词 不及物动词

1. stumble (trip):

2. stumble (while talking):

upon [əˈpɒn, -ˈpɑ:n] 介词

1. upon (on top of):

2. upon (around):

3. upon (hanging on):

4. upon (at time of):

5. upon (long ago):

在《PONS词典》中的词汇

stumble [ˈstʌm·bəl] 动词 不及物动词

1. stumble (trip):

2. stumble (while talking):

upon ·ˈpan] 介词

1. upon (on top of):

2. upon (around):

3. upon (hanging on):

4. upon (at time of):

5. upon (long ago):

Present
Istumble
youstumble
he/she/itstumbles
westumble
youstumble
theystumble
Past
Istumbled
youstumbled
he/she/itstumbled
westumbled
youstumbled
theystumbled
Present Perfect
Ihavestumbled
youhavestumbled
he/she/ithasstumbled
wehavestumbled
youhavestumbled
theyhavestumbled
Past Perfect
Ihadstumbled
youhadstumbled
he/she/ithadstumbled
wehadstumbled
youhadstumbled
theyhadstumbled

PONS OpenDict

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单语范例(未经PONS编辑处理)

While much of the cache consists of confiscated bottles of water and sunscreen, volunteers never know what unusual oddments they might stumble upon.
www.ctvnews.ca
The book is written about a group of three men who stumble upon enchanted armor of unfathomable, immense powers that they have no clue about.
en.wikipedia.org
On the third day of their trip, they stumble upon the ruins of a strangely shaped house bordering a large lake.
en.wikipedia.org
At the beginning of the adventure, the characters become lost in a desert sandstorm and stumble upon the entrance to a pyramid.
en.wikipedia.org
One day, while they were playing together in a forest, they unexpectedly stumble upon a wooden treehouse located in this forest.
en.wikipedia.org

在双语词典中的"stumble upon"译文