Learner's definition of RARELY
[more rarely; most rarely]
: not very often不常；（次数）很少 -
She rarely talks about her past.她很少谈论自己的过去。
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These machines only need to be fixed very rarely. = These machines rarely need to be fixed.这些机器很少需要修理。
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The temperature rarely [=seldom] drops below freezing here.这里气温很少降到冰点以下。
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Rarely do we see this kind of weather in our area.我们这个地区很少见到这种天气。
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Only rarely is surgery necessary to treat this condition.只有在极个别情况下，才需要动手术治这种病。
rarely if ever
— see ever