on occasion造句
It is, however, necessary
on occasion to work outwith these hours.
然而，有时候在这些时点之外也需要工作。
He treated them seriously and,
on occasion, entertained them hilariously.
他对待他们严肃认真，偶尔又逗得他们捧腹不已。
Nobody is perfect, and everyone acts thoughtlessly
on occasion.
人无完人，谁都难保不偶尔疏忽一次。