not occurring often; rare
不经常发生的;偶有的;罕见的
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her visits were so infrequent .她真是很少来访。
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infrequentadj.不经常发生的;偶有的;罕见的
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frequentadj.频繁的;时常发生的;惯常的;经常做某事的;间隔很近的;快的;急的
"mid 16th cent. (in the sense ‘little used, seldom done, uncommon’): from Latin