ABC's

1 初步

primary elementary preliminary introductory rudimentary initiatory abecedarian propaedeutic element initiative fringe alphabet ABC rudiment

2 入门

entry-level propaedeutic isagogics element introduction initiation ABC lead-up rudiment

3 基础

basic fundamental base ground bottom foundation basis root cornerstone footing pedestal grounding groundwork bedrock ABC underpinning rudiment substructure substratum fundament Hardpan staddle principium underpinner substruction

4 字母

alphabetic Kufic abecedarian christcross-row crisscross-row character letter ABC