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English

1. motive force
2. motivation
3. prime mover
4. first cause
5. agent

粵語 — Cantonese

1. 推動某樣嘢一直前進嘅原因（量詞：股）

Examples

• 雖然份工好辛苦，但我兩個仔就係令我堅持落去嘅原動力。

  Although my work is tough, my sons are the motivation that keeps me going.

• 只要你有一個心愛的人,你就有了原動力,你就能面對全世界。

  As long as you have someone you love from the heart, you have a motivating force and you can face the entire world.

  Tatoeba · GlossaMatik CC BY