Abacus

GRE 蓝宝

解释

GRE 红宝书

Abacus

• n. 算盘
• ［类］ abacus: calculate / sextant: navigate ( 算盘用来计算 / 六分仪用来航海)

Webster Collegiate

noun (plural abaci or abacuses)

• Etymology: Latin, from Greek abak-, abax, literally, slab
• Date: 14th century
• 1. an instrument for performing calculations by sliding counters along rods or in grooves
• 2. a slab that forms the uppermost member or division of the capital of a column

记忆

这是在中国很古老的时候用的了。英语还考个？ 第一个词，还用方法吗:)

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