三句不离本行

Explanation: Bank: personal trades. Words to describe a total want to address their own trades. 　　Source: Qing Li Baojia 'Bureaucrats' 34th back: "Wherever he went, separated from our opening three sentences, and immediately pulled from the arms to donate books to send posters." Qing Yi Suo "Yellow Hydrangea" X back: "I am a medical industry, you will not laugh at me three separated 本行." 　　Examples: You ~, education, education, my layman neglected. ★ tao "Ni-hwan's" Chapter