[求助]杨鹏难句 30句

Perhaps the fact that many of these first studies considered only algae of a size that could be collected in a net(net phytoplankton), a pratice that overlooked the smaller phytoplankton (nannoplankton) that we now know grazers are most likely to feed on, led to a de-emphasis of the role of grazers in subsequent research.

书中的解释说fact后跟的是一个定语从句，但是我个人认为应该是同位语从句。如果是定语从句，fact应当在从句中充当一定的成份，可是好像在从句中并不能找到适合fact的位置。感觉同位语从句更能解释的通一些。

不知各位有什么想法，谢谢！