时间和地点的副词 - 低频副词

not at any point in time

从不, 绝不

on any occasion

曾经, 随时

in a manner that almost does not occur or happen

几乎不, 很少

for one single time

一次, 仅此一次

for a single instance

一次, 仅一次

for two instances

两次, 两回

on a very infrequent basis

很少, 罕见地

used to refer to something that happens rarely or infrequently

很少, 不常

on very rare occasions

不常, 极少

in an infrequent and unpredictable manner

偶尔, 不定期地

not on regular occasions

不寻常地, 不常地

not on a regular basis

偶尔, 不时

on irregular but not rare occasions

on occasions that are not regular or frequent

at moments that are not constant or regular

有时, 偶尔

at infrequent intervals

偶尔, 有时

at irregular intervals

定期地, 不规律地