The electric wand in the experiments essentially uses electricity to push the flame away from the burner, detaching it from the fuel source, so it goes out.
实验中的电棒本质上是用电把火焰从燃烧器中推开，把它从燃料源中分离出来，然后火就熄灭了。
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The idea comes from a St Andrews University scientist challenged to find out just what is inside a flame.