From hollow ground to sturdy.

从松软的土地到坚实的岩坻。

youdao

This paper analyzed the effect of shielding between hollow grounding devices and between hollow grounding device and ground grid.

并通过模拟试验分析了接地坑、自然水对降低空腹式接地装置的接地电阻的作用。

youdao

Their seed heads raised just high enough above the ground to catch the wind, the plants are no bigger than they need be, their stems are hollow, and all the rigidity comes from their water content.

它们的种子的顶端向上生长，其距离地面的高度刚好可以接触到风；它们的体型大小也刚好是生长所需的尺寸；它们的茎是空心的，且仅仅是通过体内的含水量来保持自身的坚挺。

youdao

But that call for a new global order may ring hollow with those struggling on the ground.

CNN: Analysis: Why Iran is caught in currency crisis