on occasion
成語所屬單字occasion
on occasion — 慣用語
1. from time to time; not regularly but more than once.
1.慣用語
釋義
偶爾；有時
from time to time; not regularly but more than once.
例句
Dr. Yamamoto still teaches a graduate seminar on occasion, despite being retired.
The old radio crackles on occasion when the wind shakes the antenna.