• 1. primary power source: 一次能源 | 主动力源 | 一次电源
• 2. primary electrical power source: 主电源

• 1.I think that there are two trends working in solar's favor as the primary power source of the future.
  我认为，有利于太阳能成为主要电能来源的趋势有两个。
  dict.yoduao.com
• 2.The present invention provides a method for estimating the power capability of the primary power source of a hybrid vehicle.
  本发明提供一种用于估计混合动力车辆主动力源功率能力的方法。
  dict.yoduao.com
• 3.The first, second and third indicators are then combined to obtain an estimate of the power capability of the primary power source.
  接着组合第一、第二和第三指示符，以获得对主动力源功率 能力的估计。
  dict.yoduao.com

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