Arch: an arch that your robot can drive around or under.

Arch：机器人可以绕过或从下面通过的拱形结构。

youdao

Arch last:better support and containment is suit high arch of foot;

支撑包裹性更好，适合较高足弓；

youdao

Arch last:better support and containment is suit high arch of foot;

支撑包裹性更好，适合较高足弓；

youdao