very heavy mental retardation 极重度精神发育迟滞
There exists heavy mental pollution in researching area, especially in industry area.
研究地区土壤重金属污染较为严重，其中以工业区最为严重。
The mechanism is involved chelation with heavy mental and changes of physicochemical properties in soil.
硅抑制作物吸收重金属的机理主要涉及硅与重金属的螯合作用、土壤理化性质的改变。
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。
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