[计]算术运算

psychological operations───心理手术

arithmetic means───算术平均数

arithmetic progressions───算术级数

arithmetic series───[数]算术级数，等差级数

logical operations───逻辑运算

surgical operations───外科手术式的作战；切开手术

mathematical expectations───数学的期望值

The so-called " natural " arithmetical operations retain commutativity at the expense of continuity.───所谓的“自然”算术运算以损失连续性的代价保持了交换律。

A widely known achievement of radio electronics is an electronic calculating machine that can perform several thousand arithmetical operations in one second.───电子计算机是无线电电子学的一项人所共知的成就，这种计算机一秒钟能进行数千次运算。

A widely known achievement of radio electronics is electronic calculating machine that can perform several thousand arithmetical operations in one second.

A widely known achievement of radio electronics is an electronic calculating machine that can perform several thousand arithmetical operations in one second.