For clarity and flow i would use the institution's in place of either its or their. If everyone in the their group. If each of the their has an x, then you are talking about multiple xs, and should use the plural form of x.
They和them和their的区别是在句中的成分不同、意思不同、用法不同。 1、在句中的成分不同:them (他她它们)是they的 宾格,一般在介词后 their (他它她们的)是they的 形容词性物主代. The general rule is that, when talking about things, you use its for singular and their for plural. Sometimes i get frustrated, because i do not see their difference.
8 their x just means x belongs to multiple people. Their has an odd clumping effect as you intuit. Its could also refer to the model's particular size and. What is the difference between their and theirs, and how is should use them?