Much better to stick with a two-level system of pass and fail, or (if you will insist on such elitism) one extra level of “pass with distinction” for the top quartile.

最好还是继续两级方案，即通过和不通过，或者（若坚持精英主义）再为顶尖者增加“优秀通过”这个额外的级别。

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With the time-dependent perturbation theory, the dynamics of a two-level system coupled to an Bose field is revisited.

从含时微扰论的角度出发，重新求解了与玻色场相耦合的两态系统的动力学。

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The semiclassical laser theory proposed by Lamb for two-level system is extended to the case of dye lasers. Mode coupling equations are deduced, and a discussion is given.

本文将兰姆的二能级半经典激光器理论，推广至染料激光器系统，得出模式耦合方程，并作了些具体讨论。

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Gloucestershire, Staffordshire, Warwickshire and Worcestershire are all upper-level authorities in a two-tier system with district councils like Cheltenham, Tamworth, Wyre Forest and Stratford-on-Avon underneath them.

BBC: Elections to show why county councils count

Themost impressive feature of the massive system is its ability to install two power supplies, giving enthusiasts an unlimited level of power to handle the most intense hardware configurations.

ENGADGET: Digital Storm's Hailstorm II relieves you of gaming PC claustrophobia, $2,760 cash

Monday's briefing will also confirm that Mr Gove has dropped plans for a two-tier exam system - with more academically-able students taking an O-level type exam and the rest taking an easier test.

BBC: GCSE exam changes to be announced by Michael Gove