A symplectic integrator is viewed as promise of being a valuable tool in the numerical exploration of planetary and satellite n-body systems in the solar system dynamics.

在太阳系动力学中，辛积分器已成为研究哈密顿系统的长期定性演化的最佳工具。

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The C/N ratio is commonly used in satellite communication systems to point or align the receiving dish;

C / N比率是卫星通信系统中常用的点或使接收天线；

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The United States maintains that the self-described satellite launch would violate U.N.Security Council Resolution 1718, which bans North Korean nuclear weapons and ballistic missile tests, and was approved after Pyongyang's 2006 nuclear test.

VOA: standard.2009.03.12

He also amassed a network of 3, 000 vendors, like Acme Satellite in Klamath Falls, Ore. and Cosmic Satellite TV in Alamogordo, N.

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Last month, North Korea launched a satellite, again violating a U.N. ban on its testing of missile-related technology.

WSJ: North Korea Plans Nuclear Detonation

The last time Pyongyang carried out what it described as a satellite launch, in April 2009, the U.N.

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