简便：可以避免一般千斤顶在负载时必需双手操作或摇杆容易脱钩的缺点，配套的扳手与菱角螺杆起着互相固定的作用。

Convenience : The water chestnut of the screw can fit exactly into this special desighed spanner, which avoids the problem of slipping out as using the normal jack handles.

youdao

简便：可以避免一般千斤顶在负载时必需双手操作或摇杆容易脱钩的缺点，配套的扳手与菱角螺杆起着互相固定的作用。

Convenience : The water chestnut of the screw can fit exactly into this special desighed spanner, which avoids the problem of slipping out as using the normal jack handles.

youdao