"Summer vacation plan" in Engpsh can be written as "Summer hopday plan" or "Summer break plan."

The phrase "summer vacation" comes from the tradition of taking time off during the summer months, when the weather is warm and school is not in session. "Vacation" is a noun that refers to a period of time when one is away from work or school in order to rest or travel. "Hopday" is also a noun that means a day of celebration or a period of time when one is away from work or school for a specific purpose. "Break" is a noun that means a period of time when one stops doing something, often for rest or relaxation.

Example sentences:

"I'm making a summer hopday plan to visit my grandparents in the countryside."
"I'm planning to take a summer break in Hawaii with my friends."
"I'm looking forward to my summer vacation because I can finally relax and catch up on my reading."

中文翻译:

"我正在制定一个暑假假期计划去农村拜访我的祖父母。"
"我计划和朋友们一起在夏威夷度暑假。"
"我期待着暑假,因为我终于可以放松身心,补充阅读。"