中軸

axis / (bicycle) bottom bracket

China / Chinese / surname Zhong

within / among / in / middle / center / while (doing sth) / during / (dialect) OK / all right

to hit (the mark) / to be hit by / to suffer / to win (a prize, a lottery)

axis / axle / spool (for thread) / roller (for scrolls) / classifier for calligraphy rolls etc

see 壓軸戲|压轴戏[ya1 zhou4 xi4] / Taiwan pr. [zhou2]

central axis (line)