尺寸小于标准的凸轮轴主轴承轴颈。
但很久前，地球表面上10英尺的人类是很标准的尺寸，因为重力远小于现在，可让身体更轻并快捷移动。
Long ago, 10-foot human forms upon the surface of the earth were the norm, and gravity far less of a pull allowing the form to weigh less and move in ease.
描述比标准方法钻进的井眼尺寸大大缩小的井眼(与套管程序有关)的一种不很精确的术语，通常井眼直径小于6英寸。
An inexact term describing a borehole (and associated casing program) significantly smaller than a standard approach, commonly a wellbore less than 6 in. in diameter.
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