中流砥柱

mainstay / cornerstone / tower of strength

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)

midstream

to flow / to disseminate / to circulate or spread / to move or drift / to degenerate / to banish or send into exile / stream of water or sth resembling one / class, rate or grade

baffle (pier) / whetstone

pillar / CL:根[gen1]