What 4d is, is the get off the fence dimension.

第4维度，是“跨过栅栏”的维度。

youdao

A fence divides off the western side of the grounds.

篱笆把庭院的西面隔开。

《牛津词典》

The plane veered off the runway and crashed through the perimeter fence.

这架飞机突然偏离了跑道并且冲断了周边的护栏。

《柯林斯英汉双解大词典》

U.S. Rep. Bob Inglis, who represents the Greenville-Spartanburg area, jumped off the fence to endorse Huckabee last month.

CNN: Huckabee shakes up GOP race in South Carolina

They can help get someone off the fence who is considering buying a sponsorship or pricey luxury suite.

FORBES: One Ownership Lesson For Magic Johnson From Jordan, Lemieux And Ryan

If you have been sitting on the fence wondering about what do with your project or kit, now is the time to get off the fence and start selling.

FORBES: Kitmakers say Make It Yourself