"at such junctures he always had an impulse to leave"
"it was needed only on special occasions"
"the party was quite an affair"
"an occasion arranged to honor the president"
"a seemingly endless round of social functions"
"there was no occasion for complaint"
"on the occasion of his 60th birthday"
"there was never an occasion for her to demonstrate her skill"
I met strangers on that occasion.
在那次我遇见了一些陌生人。
I call on him on occasion.
我偶尔去拜访他。
I have no occasion to see him these days.
我最近没必要见他。
His long silence occasions me great anxiety.
他漫长的沉默让我焦虑不已。