Janie is amazed how Jim can recognize and identify people who are of different Asian ethnic groups, because she really struggles with this type of identification. One can assume from this example that Jim:

Answer: Jim has spent some time with Asians and has experience interacting with them

Explanation: In order to be able to distinguish and recognise Asian ethnic groups where there are some differences between those ethnic groups, someone like Jim had to have experience and spend some time with them that was sufficient to learn these differences. It is the same with all other ethnic groups, which are far from one's culture and climate, in order to get closer to them and to be able to recognise those ethnic groups that are not close to us we have to spend time with them. That is how the differences between these ethnic groups are most easily noticed, because then we learn about their culture, language, daily life, tradition, all of which, in fact, allow us to study these groups more deeply, and thus distinguish them.