astride

1.He rode astride.

他骑在马背。

2.The tobacconist on the other side of the street brought a chair out on to the pavement in front of his door and sat astride it, resting his arms on the back.

对面人道，卖烟的搬出一把椅子，倒放在门前，双骑，只胳膊放在椅背。