These findings suggest that deficiency in brain serotonin synthesis may be an important risk factor for depression. "2."
这些结果表明，大脑内5 -羟色胺合成不足可能是抑郁症的重要危险因素。
2
A deficiency may be a risk factor for heart disease and stroke.
缺少它可能对你的心脏病和心率跳动都是很危险的。
3
IDDs still constitute a public health problem throughout urban areas in the Sudan and iodine deficiency appears to be the main etiological factor involved.