Probably because of relatively weak thigh muscles and a lack of foot support.

可能是由于相对羸弱的大腿肌肉以及缺乏脚的支撑。

youdao

Anatomically correct for proper heel, arch, and foot support when walking.

解剖适当的脚跟，足弓和脚支撑，行走时，正确的。

youdao

Spirometry, Ent, Sleep Disorders, Eeg, Scales and Foot Support Medical, Diagnostic and Hospital Supplies.

采购产品肺，耳鼻喉科，睡眠障碍，脑电图，鳞片和足部支持医疗，诊断及医院用品。

youdao

Their 160-foot aluminum masts could barely support the loads placed on them, and the sails put thousands of pounds of tension on lines that had to be hauled by hand.

FORBES: Magazine Article

The Park Place search begins a day after the NYPD announced that Boeing officials had determined that the 5-foot-tall, 3-foot-wide wreckage is a support piece attached to the wing of an aircraft, and not a piece of landing gear as originally believed.

WSJ: 9/11 Remains Sought in Debris Behind New York City Building

Indeed, it's the support at the ball of the foot that gave my pair their distinct feel.

FORBES: The Sole of Stefano Bemer