The wing of a bat and the arm of a man are homologous.

蝙蝠的翅膀和人类的手臂是相应的。

youdao

Handed the opening day assignment in place of injured Johan Santana, Niese enjoyed a big afternoon with both his arm and bat.

WSJ: Niese, newcomers lead Mets to 11-2 rout of Padres

Matt Harvey, the Mets' 24-year-old right-hander, got to show off his bat as well as his arm.

WSJ: Thrown out: Cubs lose to Mets 3-2

At No. 19--Bob Feller's arm or Tony Gwynn's bat?

FORBES