轴心

轴心	zhóu xīn	axle / (fig.) central element / key element / axis (alliance of nations)
轴	zhóu	axis / axle / spool (for thread) / roller (for scrolls) / classifier for calligraphy rolls etc
轴	zhòu	see 压轴戏 / Taiwan pr. [zhou2]
心	xīn	heart / mind / intention / center / core / CL:颗,个