at infrequency 不经常
with infrequency 很少地
due to infrequency 由于不频繁
note the infrequency 注意其稀少性
infrequency of visits 访问的稀少
A: Why did you forget to renew your subscription?
A：你为什么忘记续订你的订阅了？
B: It was due to the infrequency of the reminder emails.
B：这是因为提醒邮件发得不频繁。
1) 不经常；稀少
2) 罕见；少见
3) 低频状态
1. 不频繁；稀少
noun
1. The state or condition of not occurring or happening frequently; rarity.
Synonym: rarity, scarcity, sparseness