请问大师:holiday, holidays vacation 有什么区别

　　holiday(holidays)一般指“休假”
　　Tom and I are going to have a holiday.我和汤姆准备去度假.
　　I've already had my holidays this year.我今年已经度过假了.
　　During a holiday in Sweden,I found this note on my car.
　　在瑞典度假期间,我在我的车子上发现了这张字条.
　　Postcards always spoil my holidays.明信片总是弄得我过不好假日.
　　My holidays passed quickly,but I did not send any cards to my friends.
　　我的假日过的很快,但是我一张明信片也没有寄给朋友.
　　注：have a (或one's)holiday 度假,during a holiday 在一次假期中.这种用法的holiday 总用单数形式,但并不只是“一天”假.复数形式的holidays 泛指“假日”,如summer holidays 暑假.但“Sunday is a holiday ”中的holiday 却是“一天”的假.
　　She has gone to Canada on vacation.她到加拿大去度假.(= holiday)
　　The city was covered with holiday clothes.(喻义时只能用holiday,不能用vacation.)(vocation职业、天命)
　　holiday一两天的假/holidays长假/vacation一般不用复数,另有“(法庭)休庭期”之意.
　　而 vacation 在英国指大学的寒暑假或法定不工作的日子,美国可指任何假日（期）
　　The students are planning how to spend their summer vacation.
　　这些大学生在计划着怎样过暑假.
　　Mr.Fuller is on vacation now.费勒先生在度假.
　　So as to be away from work or duty:离开工作或职责：
　　They took a day off.他们休息一天take a day off休假一天
　　Spent away from work or duty:休假的在离开职责中度过：
　　My off day is Saturday.我的休息日是星期六
　　an off day休假日off hours空闲的时间
　　three days off an off season淡季