well-defined horizons 土层界限
three well-defined horizons 三个具限分明的土层
defined horizons
定义的视野
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Bleaching and characterization were morphologically apparent, but not well developed as to be defined as bleached or claying horizons.
三个土壤剖面均有一定的漂洗和淀积粘化现象，但都不足以定义成漂白层或粘盘层。
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