never
[副词]
not at any point in time
从不, 未曾
Ex: This old clock never worked properly , not even when it was new .
这个旧钟从未正常工作过，即使在它还是新的时候。
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hardly ever
[副词]
in a manner that almost does not occur or happen
几乎从不, 很少
Ex: He hardly ever takes a day off from work .
他几乎从不请假。
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once
[副词]
for one single time
一次, 仅一次
Ex: He slipped once on the ice but caught himself .
他在冰上滑了一次，但稳住了自己。
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rarely
[副词]
on a very infrequent basis
很少, 极少
Ex: I rarely check social media during work hours .
我很少在工作时间查看社交媒体。
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登录seldom
[副词]
used to refer to something that happens rarely or infrequently
很少, 不常
Ex: They seldom see each other , even though they live in the same city .
尽管他们住在同一个城市，但他们很少见面。
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登录infrequently
[副词]
on very rare occasions
很少, 不常
Ex: They communicated infrequently, but their friendship remained strong .
他们很少交流，但他们的友谊依然牢固。
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sporadically
[副词]
at irregular and unpredictable intervals of time
零星地, 不定期地
Ex: The clock 's alarm goes off sporadically, even when unset .
时钟的警报偶尔会响起，即使没有设置。
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uncommonly
[副词]
in a way that is rare or not customary
不常见地, 罕见地
Ex: Uncommonly, there were traffic jams on the usually quiet road .
不常见地，通常安静的道路上出现了交通堵塞。
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登录on irregular but not rare occasions
Ex: Every now and then, I like to watch old movies from my childhood.
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now and again
[短语]
on occasions that are not regular or frequent
Ex: Now and again, she visits her old hometown to see friends.
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登录at times
[副词]
at moments that are not constant or regular
有时, 偶尔
Ex: He can be unpredictable , getting into heated debates at times.
他可能难以预测，有时会陷入激烈的辩论。
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登录on occasion
[副词]
at infrequent intervals
偶尔, 有时
Ex: On occasion, I like to take a walk in the park to clear my mind .
偶尔，我喜欢在公园散步以清醒头脑。
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登录periodically
[副词]
now and then or from time to time
定期地，偶尔
Ex: She periodically glances at her phone during dinner .
她吃饭时时不时地看手机。
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