求翻译：消除和控制城市社会不稳定因素是消除和控制整个社会不稳定因素，实现社会安定和持续发展的关键，会起到稳定全局、事半功倍的效果。是什么意思？

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elimination and control of urban social instability is the elimination and control of the entire social instability and achieve social stability and sustainable development will be the key to the overall stability, improve their effectiveness.

Eliminates and controls the city society unstable factor is the elimination and the control entire society unstable factor, the key which the realization society stability and develops continually, can get up the stable overall situation, the twice the result with half the effort effect.

Eliminating and controlling factors in urban society is to eliminate and control factors in society as a whole, the key to achieving social stability and sustainable development, will help stabilize the overall situation and a multiplier effect.

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