A
A.一手动一手不动 B.一手主动打出 C.双手同时打出one hand moves while the other keeps still B. one hand actively plays C. both hands play at the same time
B
B.一手主动打出 C.双手同时打出one hand actively plays C. both handsplay at the same time
C
C.双手同时打出both handsplay at the same time
