rudiment：雏形，萌芽，基本原理，基础

rude,原始的，-ment,名词后缀。引申诸相关词义。

• sub
• sub-
• subaltern
• subaqua
• sub-aqua
• subaquatic
• subastral
• subatomic
• subclause
• subcommittee
• subconscious
• subcontinent
• subcontract
• subcontractor
• subculture
• subdirectory
• subdivide
• subdivisible
• subdivision
• subdue
• subdued
• subeditor
• subequal
• subgroup
• subheading