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What does 'those with third-party drug sales experience' mean?

The first terminal is talking about clinical sales, that is, the sales of medicines in hospitals.

The second terminal is talking about OTC sales, which is the sales of pharmacies in various cities.

The third terminal refers to sales other than the first and second terminals, that is, the sales of community clinics, private pharmacies, township health centers, etc. The third terminal is characterized by wide distribution, small individual sales volume, but numerous sales units, some even individuals. There is no standard sales model.