主轴

主轴	zhǔ zhóu	axis / principal axis (in mechanics, optics, botany etc) / main axle (of engine)
主	zhǔ	owner / master / host / individual or party concerned / God / Lord / main / to indicate or signify / trump card (in card games)
轴	zhóu	axis / axle / spool (for thread) / roller (for scrolls) / classifier for calligraphy rolls etc
轴	zhòu	see 压轴戏 / Taiwan pr. [zhou2]