详细解释:a. 稀少的, 珍贵的, 罕见的
词型变化：
副词:infrequently名词:infrequence英语解释：
形容词 infrequent:
not frequent; not occurring regularly or at short intervals例句：
Place for permanent or long-term storage of data, from which retrieval is infrequent. A computer archive, for instance, may be on magnetic tape.用于永久或长期存储不常检索的数据的地点(介质)。例如，计算机的档案文件可放在磁带上。