精通数字的能力。
尼德·霍夫的祖父叫马蒂，他精通数字，做了会计。
Niederhoffer's grandfather Martie, who had a good head for figures, became an accountant.
精通数字、模拟电路、控制原理、电波通讯等专业知识。
Good command of professional knowledge in digital circuit, analog circuitry, control principle, or electromagnetic wave, communication.
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