The tricks of the trade

(idm.)

(a)

clever ways of doing things, known to and used by experts

（内行人的）诀窍，窍门

(b)

ways of attracting customers, gaining advantages over rivals, etc.

吸引顾客、在竞争中取胜等的手段；生意经

e.g. She's only been with us a month so she's still learning the tricks of the trade.

她到我们这里才一个月，还正在学习行内乾坤。

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