Mental fatigue is the enemy of health.

心理疲劳是健康的敌人。

Mental fatigue is the origin of many diseases.

精神疲劳是多种病症的起源。

Portable energy drink helps fight physical and mental fatigue.

可携带的能量饮料，帮助你抵抗各种疲惫的身心。

Dehydration can lead to weakness, mental fatigue and eventually death.

脱水会导致虚弱、精神萎靡以致死亡。

These are just some of the strategies to combat stress and mental fatigue.

这只是一些与压力和精神疲惫作斗争的小策略。