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在《PONS词典》中的词汇

I. back up 动词 不及物动词

sich 第四格 stauen
back up sink
sich 第四格 über ... Kilometer stauen

II. back up 动词 trans

1. back up (support):

to back up sb/sth

2. back up (confirm):

to back up sth statement

3. back up 计算机:

4. back up (reverse):

5. back up 证券:

Present
Iback up
youback up
he/she/itbacks up
weback up
youback up
theyback up
Past
Ibacked up
youbacked up
he/she/itbacked up
webacked up
youbacked up
theybacked up
Present Perfect
Ihavebacked up
youhavebacked up
he/she/ithasbacked up
wehavebacked up
youhavebacked up
theyhavebacked up
Past Perfect
Ihadbacked up
youhadbacked up
he/she/ithadbacked up
wehadbacked up
youhadbacked up
theyhadbacked up