Correct

三句话不离本行

/ sān gōu huà bù lí běnháng / 
Strokes

Definition

to talk shop all the time (idiom)

Example

Definition

can hardly open one's mouth without talking shop; talk shop all the time

1
Nāwèi
那位
shāngrén
商人
sāngōuhuàbùlíběnháng
三句话不离本行
  
,
gōugōu
句句
dōu
都
shì
是
shēngyijīng
生意经
  
。

That businessman never opens his mouth without talking shop.