A integrated equation set for solving plane parallel motion of rigid body was derived, and the conditions of system of forces simplified on the center of mass plane was discussed.

给出了解决刚体平面平行运动问题的一组完整方程，讨论了力系简化在质心平面内的条件。

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People in daily life, due to incorrect habits, or weight-bearing long-term desk and will break the balance of the three-dimensional system of forces, resulting in spinal deformation.

人们在日常生活中，由于不正确的生活习惯，或者长期伏案工作及负重，都会打破这个平衡的三维力系，从而导致脊柱变形。

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But in an effort to keep the number of threads in the system under control, GAE forces any application-initiated connection to close after 5 to 10 seconds.

但为了在可控的系统中保持线程数，GAE会强迫任何应用程序发起的连接在5到10秒后关闭。

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"Perhaps most important,though, we can now field initial elements of the system to protect our forces in Europe and our allies roughly six to seven years earlier than the previous plan a fact made more relevant by continued delaysin the Czech and Polish ratification processes that have caused repeated slips in the timeline,".

VOA: standard.2009.09.17

Under his direction the U.S. Army Corps of Engineers developed a sophisticated system that mimicked the forces of nature.

FORBES: American Pyramids

While America has had numerous third parties, one of our system's strengths is that it in effect forces one of the major parties to co-opt and smooth out the rough edges of issues that third parties may advocate.

FORBES: Election Stranger Than Fiction

Their chemistry and composition offer direct evidence of the forces that shaped the creation of the solar system, experts said.

WSJ: Asteroid Vesta Gets a Close Study