支架(4)支撑着整个梯级，踏板(3)固定在支架(4)的上端。

The bracket (4) supports the entire steps and the tread plates (3) are fixed at the upper end of the bracket (4).

youdao

支架(4)支撑着整个梯级，踏板(3)固定在支架(4)的上端。

The bracket (4) supports the entire steps and the tread plates (3) are fixed at the upper end of the bracket (4).

youdao