very heavy mental retardation 极重度精神发育迟滞
This heavy mental activity has a way of draining your physical energy, so be sure to get the rest & relaxation you need.
繁杂的脑力工作消耗着你的体力，一定要记得休息休息，放松一下。
The increase in the use of medication among U. S. troops suggests the heavy mental and psychological price being paid by soldiers fighting in Iraq and Afghanistan.
美国士兵们对于这类药物的使用量增加表明士兵们在阿富汗和伊拉克战斗的时候付出了严重的精神和心理代价。
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