This medicine, or rather drug, has a violent effect.

这种药品，或者说麻醉剂，有强烈的效果。

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An act of pure heroism on his part sets the plot in motion, but this non-traditional film never lets us forget that it is also a violent act and, as such, has an explosive effect on everyone's life.

NPR: 'A History of Violence': A Ticking Timebomb