Where are the four medicines in Shijiazhuang, the first medicine, the second medicine and the third medicine? Why do you choose this name?

One doctor in Shenyang, two doctors in Qiqihar, three doctors in Suzhou and four doctors in Shijiazhuang.

Shenyang No.1 Pharmaceutical Factory is referred to as No.1 Pharmaceutical Factory for short.

Qiqihar No.2 Pharmaceutical Factory is referred to as Eryao for short.

Suzhou No.3 Pharmaceutical Factory is referred to as Sanyao for short.

Shijiazhuang is the fourth, so there are four kinds of medicines.