英语语法分析

The gunports were made with boolean substraction operation.

炮眼的制作应用了布尔运算。

Objective To investigate a digital substraction technique with computer image processing for diagnosis on dental X ray films.

目的研究计算机图像数字减影技术对常规牙齿X线片的诊断作用。

In complex substraction, for both right handed groups, activation of functional areas of frontal and parietal lobe had the left laterality.

病例组和对照组右利手者的额、顶叶在复杂减法计算时均体现左侧偏侧化现象。