infrequencyn.
ɪn'frikwənsi
中文n. 罕见；很少发生
词根词源
infrequency (n.)c. 1600, from Latin infrequentia "a small number, thinness, scantiness," noun of quality from infrequentem (see infrequent). Related: Infrequence (1640s).
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