三天假期英语可以说成"three-day hopday."
来源：这个词组是根据英语的数字和名词结构构建的，将“三天”的数字“three”和“假期”的名词“hopday”结合起来形成的。
例句：
I'm looking forward to my three-day hopday next week.
(我期待着下周的三天假期。)
I've planned a lot of activities for my three-day hopday.
(我已经为我的三天假期计划了很多活动。)
How do you want to spend your three-day hopday?
(你想怎么度过你的三天假期？)