the strongest performance "by" any of the world’s biggest economies. - 英檢

http://www.nytimes.com/2011/04/18/business/global/18yuan.html

請問大家第三段的最後一句

,by far the strongest performance "by" any of the world’s biggest economies.

為什麼介係詞是用by呢？

感覺用in或among都比較順QQ

謝謝!

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