The control system has two level control system and two communication network.

整个控制系统由二级控制系统和二层通讯网络构成。

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On the basis of light interaction with two-level atomic system, we derive the interaction solitary wave equations, its solution and two necessary conditions for the existence of the solution.

在光与二能级原子系统相互作用的基础上，我们导出相互作用孤立波方程组及其精确解，以及存在解的两个必要条件。

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The atomic dipole amplitude squared squeezing in the interaction system of the two identical two level atoms with single mode vacuum field is studied.

研究了两个全同的二能级原子与单模真空辐射场相互作用系统中原子的偶极振幅平方压缩效应。

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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

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