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

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