The sense of mission, without which man won't go that far, is the internal source of motivation.
使命感是动力的内在源泉，没有明确使命感的人走不了太远。
The traditional moral noumenon in China was a dual one which regarded "God" as an external source and "Heart" as an internal source.
中国传统道德本体是以“天”（天帝）为外倾之源和以“心”（良心）为内倾之源的二元道德本体；
Of course, the sales force is not the only internal source for key account managers.
当然，销售队伍不是关键客户经理的唯一内部来源。
By developing new input air effect, removing and controlling internal source of pollution, we can improve IAQ.
通过发挥新风效应、消除和控制室内污染源等方法可以改善室内空气品质。
By developing new input air effect, removing and controlling internal source of pollution, we can improve IAQ.
通过发挥新风效应、消除和控制室内污染源等方法可以改善室内空气品质。
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