舰船推进轴系是舰船动力装置的重要组成部分，它的稳定性是舰船生命力的基本保证。
The propulsion shaft is the most important component of power device of the ship; its stability is the basic promise of the ships life.
电力系统作为目前舰船的主推进动力装置，其地位和作用越来越重要，电力系统生命力已经成为舰船生命力的重要组成部分。
Currently the electric power system is regarded as the main propulsion equipment on naval vessels and becomes more and more important.
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