DmitryFarber wrote:
"With university lecture halls rivaling small-concert venues in terms of the number of those in attendance, it is incumbent upon incoming freshmen--most long coddled in an intimate learning environment--to become adept at navigating the treacherous waters of anonymity."
The opening modifier tells us that a university lecture hall may hold as many students as a small concert hall. In other words, some university classes have a whole lot of students!
"It is incumbent upon"
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