[請益] 這句的who的用法？

[eebarry (阿部)]

"There's a lot of these guys in the back stretch who, if somebody says this will make your horse run faster, they'll give it a shot," says Bogdanich.

這句的who是人的關係代名詞嗎？
還是有特別的用法？

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◆ From: 165.91.10.75
→ Widder8:我是覺得是關代，代前面那個guys，可能是因為口語沒注意到
→ Widder8:所以後面又跑出個they來。也因為口語，所以才會以There's
→ Widder8:去接複數名詞guys...