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。

• laser
• laserdisk
• laser gun
• lash
• lashing
• lass
• lassa fever
• lassitude
• lasso
• last
• last call
• last ditch
• last-ditch
• last-gasp
• last hurrah
• lasting
• last name
• last straw
• latch
• latchkey
• latchkey child
• late
• Late Latin
• latent
• later