e of ＋ 抽象名词表示主语具有该抽象名词的特点、性质等等.
上句的value为抽象名次,该句的意思是：它们已经证明了其极高的商业价值.句中的prover应该是proven.
再如：
I hope that I can be of some help.我希望我能有所帮助.
They have prover themselves to be of great commercial value里
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