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
绝不
on any occasion
到目前为止
in a manner that almost does not occur or happen
几乎没有
for one single time
一次
for a single instance
一度
for two instances
两次
on a very infrequent basis
很少
on a very uncommon basis
on very rare occasions
in an infrequent and unpredictable manner
零星地
not on regular occasions
不常见的
not on a regular basis
偶尔
on irregular but not rare occasions
有时
on occasions that are not regular or frequent
at moments that are not constant or regular
at infrequent intervals
at irregular intervals
定期地
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