... hollow glass material 空心玻璃材料 hollow half round 空心半圆棒 hollow hub 空心桨毂 ...
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hollow half-round bar 空心半圆钢条
hollow half-round steachdard 空心半圆钢条
·2,447,543篇论文数据，部分数据来源于NoteExpress
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。
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