keep upright

美 　英

• 網(wǎng)絡(luò)切勿倒置；請勿倒置；保持直立

例句

"When I first got on it I thought it would never work and at a slow speed it" s almost impossible to keep upright.

當(dāng)我第一次駕駛時，我認(rèn)為它肯定是沒辦法上路的，而且速度會非常的慢，并且要走直線也是很難的。