LanGeek
这些副词表明某事发生的不规则或不频繁，例如“从不”、“很少”、“偶尔”等。
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not at any point in time
从不
on any occasion
曾经
in a manner that almost does not occur or happen
几乎不
for one single time
一次
for a single instance
for two instances
两次
on a very infrequent basis
很少
used to refer to something that happens rarely or infrequently
on very rare occasions
不常
in an infrequent and unpredictable manner
偶尔
not on regular occasions
不寻常地
not on a regular basis
on irregular but not rare occasions
on occasions that are not regular or frequent
at moments that are not constant or regular
有时
at infrequent intervals
at irregular intervals
定期地
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