intrinsic electron or hole concentration 电子或空穴本征浓度
a hole concentration 空穴浓度
hole carrier concentration 空穴载流子浓度
hole-edge stress concentration 孔边应力集中
The paper introduces the design course of the modular machine tool for multi-hole concentration gearbox.
介绍了多孔密集型箱体组合机床的设计过程，实际证明该机床设计严谨规范，又有技术创新，使用效果良好。
Most astronomers believe that the large concentration of mass at the galaxy's center is a black hole whose gravity is causing the gas to whirl.
大多数天文学家认为，星系中心的大量物质是一个黑洞，它的引力导致气体旋转。
The hole isn't literal; no part of the stratosphere is empty of ozone. But scientists use the hole metaphor to describe the area where ozone drops below a historical concentration of 220 Dobson Units.
这里所谓的“空洞”不是字面上含义，并不存在任何一处平流层完全没有臭氧，科学家们用空洞这一说法来描述这些臭氧浓度低于历史读数220多布森单位的区域。
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