intrinsic electron or hole concentration 电子或空穴本征浓度
a hole concentration 空穴浓度
hole concentration factor 炮孔密集系数
oxygen hole concentration 氧空位浓度
concentration hole concentration 空穴浓度
two dimension hole concentration 二维空穴气
hole carrier concentration 空穴载流子浓度
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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