infrequence的用法和樣例：
例句
用作名詞 (n.)
- Doctor is looking for the blood donor who can offer infrequence blood to the patient.
醫生正在尋找能給一個血型罕見的病人輸血的獻血者。 - The doctors were overwhelmed by the infrequence of the illness, however they calmed down at once and they began to examine my husband.
病情的罕見，把醫生們都嚇倒了，但是他們很快冷靜下來，給病人做全身檢查。
