on the part of

不明白这个短语的意思，请NN指点，谢谢！

以下是FEIFEI135上的例句：

2. During the 1980’s, Japanese collectors were very active in the market for European art, especially as purchasers of nineteenth-century Impressionist paintings. This striking pattern surely reflects a specific preference on the part of many Japanese collectors for certain aesthetic attributes they found in nineteenth-century Impressionist paintings.

124. It is repeatedly claimed that the dumping of nuclear waste poses no treat to people living nearby. If this claim could be made with certainty, there would be no reason for not locating sites in areas of dense population. But the policy of dumping nuclear waste only in the more sparsely populated regions indicates, at the very least, some misgiving about safety on the part of those responsible for policy.

部分阿

on the part of sb是个固定词组，你可以查查字典，意思是（关于）某人的...

This phrase tortured me for a while in the past, it is kind of a abstract structure and really sounds stilted. After confused by it several times, I realized that it simply means 'of' in most of the cases. So just replace it with 'of'. Only when 'of' doesn't function well occasionally, then regard it as "在...那一边". Yet the situation of latter is very scarce and rare.