求翻译：整个龙门铣床主要包括横纵向进给机构、立柱、横梁、底座、工作台等主要组部件。其中所有进给机构均采用滚珠丝杠进行传动，并由伺服电机进行驱动。而横梁是实现机床X向运动的主要执行机构，可靠合理的结构是保证机床的必要条件。是什么意思？

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The entire portal milling machine are mainly horizontal vertical feed, columns, beams, base, work desk, and other major components. All of these agencies are the Ball Screws to drive, and the servo motor drive. The beam is to achieve the movement to the machine X main executive body, reliable ration

The entire planer-type milling machine mainly includes the horizontal longitudinal feed mechanism, the column, the crossbeam, the foundation, the work table and so on the main group part.In which all advanced gear uses the ball bearing guide screw to carry on the transmission, and carries on the act

Entire gantry milling machines including horizontal longitudinal feeding mechanism, base, table, column, beam, and other major components. All feeding mechanism using ball screw drive and driven by a servo motor. Machine x beam is movement of the main implementing agencies, reliable, reasonable stru

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