occasions是什么意思？

In a 2011 study, for instance, people who drank the same 380-calorie(卡路里) milkshake on two separate occasions produced different levels of hunger-related hormones (荷尔蒙), depending on whether the shake's label said it contained 620 or 140 calories.

Mr David Rossi stated that he had spoken with McLaughlin on several occasions about his driving record.

But it is natural to desire to do so for special occasions.

On occasions it is the fear that certain disclosures may be unacceptable to family or friends that motivates an individual to seek professional help.

On the occasions when hunting has been tried, local animal rights people have worked to secure court orders against the hunts.

Now, I'd like to begin by saying that I have on occasions used an interpreter myself as a foreign correspondent.