four-level laser [激光] 四能级激光器 ; 四能阶雷射
four-level solid laser [激光] 四能级固体激光器
four-level laser rod 四能级激光棒
four-level emitter 四能级放射体
four level laser 四能级激光器
four-level laser system 四能级系统
four-level fluoresent crystal 四能级荧光晶体
Kirkpatrick's Four-level Model of Evaluation 四阶层评估模型
Four Level of Leadership 领导的四个层面
Based on the rate-equation theory of four-level system, the expressions of threshold pump power, output power and slope efficiency are given.
在本章中，我们首先从四能级激光系统空间速率方程理论出发，得到了阈值泵浦功率、输出功率和斜效率的表达式。
参考来源 - LD双端端面泵浦的高功率连续单频Nd：YVO·2,447,543篇论文数据，部分数据来源于NoteExpress
The concept was to create a four-level diaphanous structure, which integrates all functions of living and working and yet offers enough privacy.
设计理念是创造出一个四层的透明体量，将所有的起居和办公功能都包含在一起，但同时为住户提供极大的隐私性。
Solid laser is a four-level system.
固体激光器是一个四能级系统。
A data transformation interface was developed to get the four-level product model.
开发了数据转换接口，获得了四层次的产品模型。
For the first time the W.H.O.raised its alert level from phase four to phase five on April twenty-ninth.
VOA: special.2009.05.06
It says H.I.V.-related deaths appear to have reached their highest level in two thousand four.
VOA: special.2009.12.08
Phase four means that a virus has gained the ability to cause community-level outbreaks.
VOA: special.2009.05.06
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