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The evil damage you do has an evil effect on people. All that negativity can have a really harmful influence on them. You should think before you do things.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
子供にゲームをさせないことによる弊害も考えておくべきです。
You should also think about how evil it is to not let children play video games.
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