by the sheer weight of numbers involved

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yjhjerry

Senior Member
Chinese
Is there not a risk that the boom in cultural tourism, by the sheer weight of numbers involved, may harbour the seeds of its own destruction by eroding the very cultures and sites that are its stock in trade?

Is "by the sheer weight of numbers involved " a parenthesis grammatically?What does "sheer weight" mean here? Thanks in advance!
 
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