fatigue
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長時間の運転で疲労がたまっていた。
Fatigue had built up from driving for a long time.
疲労を回復するには十分な睡眠が必要だ。
To recover from fatigue, sufficient sleep is necessary.
過度の疲労は集中力の低下につながる。
Excessive fatigue leads to a drop in concentration.