如果利物浦能在明天晚上的比赛中战胜曼联的话，这也仅仅是利物浦第二次连续两个赛季双杀曼联。之前唯一的一次发生在2000 - 02赛季。
If Liverpool win it will be only the second time they've completed two successive league doubles over United. The only previous occasion was seasons 2000-02.
研究了双模真空场与两个耦合二能级原子相互作用系统的双原子偶极振幅平方压缩。
The two-atom dipole amplitude-squared squeezing in a system of a two-mode vacuum field interacting with two coupled atoms was studied.
将该问题的基本方程化为具有两个小参数的二阶非线性方程组，并在双参数摄动法和单参数多重尺度法的基础上提出了双参数多重尺度法。
The governing equations for the problem is modified into a second-order nonlinear differential system with two infinitesimal parameters and a double parameter multiple scale method is presented.
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