n. 【地质学】
平原,平地
Comparative Study on Uterine and Umbilical Artery Blood Flow During Pregnancy at Plateau and Flatland
高原地区和平原地区妊娠子宫动脉、胎儿脐动脉血流变化的对比研究
词组
noun
1.Land with no hills, valleys, or mountains.
‘the flatlands of Lincolnshire’
‘a sandy flatland dotted with marshes’
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