It's because they don't have roots.

这是因为它们没有根。

youdao

Deep-seated attitudes to women have roots in ancient agriculture.

深层次的分析妇女已扎根与古代农业【已？】

youdao

Many raster-based formats have roots in image formats: a common raster-based image format is bitmap (.bmp).

许多基于栅格的格式都有基本的图像格式：常见的基于栅格的图像格式是位图(. bmp)。

youdao

They have roots that stand in saltwater and look like cablesor ropes laid one on top of another.

VOA: special.2010.04.20

But at the same time, as Darwin well knew, emotions have universal roots that are shared across all humans and across many animals.

但同时，正如达尔文所说，情感在全球是相通的,被所有的人类和动物共享。

耶鲁公开课 - 心理学导论课程节选

There you have the roots and the kernel of the so-called "Positive good thesis "About slavery.

这样你就有了奴隶制,所谓"积极的一面"的根源和依据

耶鲁公开课 - 美国内战与重建课程节选

"It feels like we don't have roots, " he says, then adds that it feels like China has "grown up so fast" over the last decade.

BBC: New influences for China's indie musicians

Her fingerpicked guitar lines and delicate melodies have roots in traditional folk, but given a choice, her songs always choose the overgrown, lesser-worn paths that lead in unexpected directions.

NPR: First Listen: Laura Gibson's 'Beasts Of Seasons'

Militias, some of which have roots in the rebel groups that fought Gadhafi, have besieged government offices in Tripoli to pressure parliament to adopt an expansive version of the law.

NPR: Libya Passes Ban On Gadhafi-Era Officials