This band supports the arch of the foot and is under strain when the foot is bearing weight.

当脚负重的时候这个韧带在脚底心程紧绷状态。

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Flatfoot: Congenital or acquired flatness of the arch of the foot, in which the foot and heel usually also roll outward, resulting in a splayfooted position.

扁平足：先天性或后天性足纵弓平坦的一种外科病。足和足跟向外侧旋转，足弓消失，形成八字脚。

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"Good girl," said Frank, winding the bandages around the arch of her foot.

“好姑娘，”弗兰克说道，一边把绷带缠在她的足弓上。

《柯林斯英汉双解大词典》

He suggests that Gartland buy a shoe with a little extra support under the arch of the foot.

NPR: Go the Distance with a Well-Fitted or High-Tech Shoe

More than 2 million Americans suffer from debilitating heel pain stemming from inflammation of the plantar fascia, a fibrous band of tissue that supports the arch of the foot.

FORBES: The Big Hurt

Again, the transformational power of the longitudinal arch, which connects the lowly foot to exalted art.

WSJ: High-Concept Enchantments: Review of Shoe Obsession at the Museum at FIT