ㄆㄧ ㄏㄤˊ ㄉㄠˇ ㄒㄩ 批吭捣虚（批吭搗虚） 见“ 批亢擣虚 ”。
Attack the enemy at his weak points
批(pī)
吭(háng kēng)
捣(dǎo)
虚(xū)
