Definition: a small idea or event which causes something bigger to start Level: C2
他鼓励的话语在困难时期带来了一丝希望。
His encouraging words provided a ___spark of hope during the difficult times.
老师的热情是点燃我对历史兴趣的火花。
The teacher's passion was the ___spark that ignited my interest in history.
一次单独的抗议可能引发一场全国性的变革运动。
A single protest can ___spark a nationwide movement for change.
