英 [ɪnˈfriːkwənsi] 美 [ɪnˈfriːkwənsɪ]
n. 罕见；很少发生
罕见(infrequency), 此释义来源于网络辞典。
... phenomenon 现象 infrequency 稀少 oddity 古怪 ...
稀有性（Infrequency）：是否显而易見，不足为奇的？ 可行性（Workability）：是否违反限制条件或是否可实施？
infrequent 罕见的；稀少的；珍贵的；不频发的
infrequently 很少发生地；稀少地
罕见；很少发生
The paucity of known extinctions or disruptions resulting from indirect interactions may reflect not the infrequency of such mishaps but rather the failure to look for or to detect them.
间接相互作用导致的已知物种灭绝或破坏的情况的稀少，反映的或许不是这种灾难的罕见，而是没有去寻找或检测它们。
In spite of infrequency, complications secondary to placement of these surgical drains occur.
尽管不常见，但因放置外科引流管导致的合并症仍会发生。
With their greater infrequency the sounds increased in strength and sharpness. They hurt his ear like the trust of a knife;
随着频次变少，声音变得越来越大，越来越尖锐，像刀子一样刺痛他的耳朵；
Away from the hubs, routine indignities and sweaty discomforts are made worse by the infrequency of connections.
The other problem is the infrequency with which major soccer events occur.
FORBES: U.S. Women's Soccer Team's Glory Could Yield Redemption And Endorsements For Hope Solo
All of this makes sense, given the reluctance of most people to expend the mental energy, and the infrequency with which people change their minds once System One has made the call.