がいする
Verb, Transitive
1.
to injure, to damage, to harm, to hurt
2.
to kill
3.
to hinder, to obstruct
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過度な飲酒は肝臓を害する恐れがあります。
Excessive alcohol consumption can harm the liver.
彼の無責任な行動が会社の評判を害した。
His irresponsible actions damaged the company's reputation.
睡眠不足は健康を害するだけでなく、集中力も低下させます。
Lack of sleep not only harms your health but also reduces your concentration.
環境を害する開発は、長期的に見れば人類の未来を脅かすことになる。
Development that harms the environment will, in the long term, threaten the future of humanity.
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