Ruby laser is a three-level system.

红宝石激光器是一个三能级系统。

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Based on the second-order coherence function theory, authors have studied nonlinear effects of third-and fifth-order on polarization beats in a cascade three-level system (TPBCTS and FPBCTS).

本文采用二阶相干函数理论研究了级联三能级系统中三阶及五阶极化拍频(TPBCTS及FPBCTS)的非线性效应。

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The characteristics of rare earth doped fibers and the principle of fiber amplifier with three-level system are described.

简述了稀土掺杂光纤的特性，以及三能级光纤激光放大的基本原理。

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The standard was raised six times during the Clinton administration, the last of which raised the tier-three requirement to 85, 000 MTOPS, about the level of a networked system with 32 Intel Pentium III chips.

CNN: Turning the U.S. into a super-computer power

Over a distinguished career that spans three decades, Judge Sotomayor has worked at almost every level of our judicial system, providing her with a depth of experience and a breadth of perspective that will be invaluable as a Supreme Court justice.

CNN: Transcript of Obama-Sotomayor announcement

"Over a distinguished career that spans three decades, Judge Sotomayor has worked at almost every level of our judicial system, providing her with a depth of experience and a breadth of perspective that will be invaluable as a Supreme Court justice, " Obama said.

NPR: Obama To Nominate Sotomayor To High Court