This article researched on hollow-making martiral used for making middle-hollow round catalysis carrier.

制备了一种用于制造球形中空催化剂载体的造孔材料。

youdao

Conclusion: the spinal deformities in osteoporotic patients are characterized by the local kyphosis of spine, especially thoracic kyphosis, and hollow round back is the most common deformity.

结论：骨质疏松患者的脊柱畸形主要表现为脊柱的局部后凸尤其是胸段脊柱后凸角度的增大，其中又以凹圆背畸形最为多见。

youdao

The very volcanoes are located in hollows, about half a kilometer in diameter. In the center of a hollow there is a round lake filled with mud.

这些火山位于直径约一千米的洼地中。洼地中间是一个充满泥水的圆形湖。

youdao

Woods' recent performances have highlighted another part of his game that needs work: his putting -- having needed 33 in the second round at Quail Hollow, and also struggling in finishing 40th at Augusta.

CNN: Tiger Woods hits back at his critics