fluid weak-positive quality control serum 液态弱阳性质控血清
weak positive expression 弱阳性表达
In the first case, strong positive selection for the gene is dissipated by weak selection against hundreds of others.
前一种局面下，自然选择机制对好基因的积极选择，被其余几百个坏基因的逆选择白白浪费掉了。
Eastward component t shows weak positive anomaly in the studied region.
东向分量在整个区域呈现微弱的正异常。
The genetic correlation between the birth weight, weaning weight and the other propagation traits mostly were weak positive correlation or negative correlation.
初生重、断奶重分别与其他各繁殖性状间的遗传相关和表型相关大多为弱的正相关或负相关。
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