Calculator

(noun.) a small machine that is used for mathematical calculations.

(noun.) an expert at calculation (or at operating calculating machines).

戴维斯整理

• The public was skeptical, however, and some averred that he was a lightning calculator who did sums in his head and printed them on the machine. 佚名. 神奇的知识之书.
• In competition in simple addition between a lightning calculator and an ordinary Japanese small tradesman, the Japanese would easily win the contest. 佚名. 神奇的知识之书.

格雷格整理