非终点直道；反手直线球（乒乓球术语）；拔背

back straights───非终点直道；反手直线球（乒乓球术语）；拔背

stand straight───立正；站直

back light───[车辆]后灯；背景光

back stairs───adj.诡秘的，秘密的；n.厨房门；后面楼梯

back street───小街

backdraught───[建]逆通风

backs light───[车辆]后灯；背景光

backsight───n.后视；表尺缺口

go straight───直走；改过自新

Keeping your back straight, swing one leg backwards.───挺直腰背，一条腿向后摆动。

Keep your back straight.───挺直你的背.

Back: Straight and gently sloping to the hips.───回: 直并轻轻倾斜的臀部.

You should keep your back straight.───你应该把后背挺直.

Hold your head up and keep your back straight.───请把头抬起来,腰直起来.

She held her head erect and her back straight.───她昂着头，把背挺得笔直。

Keep back straight and bend knees.───背要直，只弯两膝。

Kneeling: Kneel upright with your weight on your knees and your back straight.───行双膝跪礼时,是直式的跪,身体的重量集中于双膝,背部要直.

Your head should be up, your back straight, and shoulders level.───你的头应该抬起来，你的背部笔直，肩膀水平。

He plans to kick for home on the back straight.───他打算在终点对面的直道上就开始冲刺.

Start with your back straight and your feet together and pointing forward.───挺胸拔背,双脚并拢,脚尖向前.

Keep your back straight and vertical.───保持背部挺直.

Keep back straight and your shoulders loose.───保持后背挺直,双肩放松.

Keep your head upright, shoulders horizontal, chest broad, back straight.───头容正, 肩容平,胸容宽, 背容直.

I went to overtake him on the back straight on the last lap.───最后一圈时我在非终点直道上超过了他。

I wrote back straight away to thank Dick for his invitation.───我直接写回信给迪克,感谢他的邀请.

He walked at a rapid pace with his back straight and his head held erect.───他昂首挺胸地快步而行。

Hold your head up and keep your back straight.

Keeping your back straight, swing one leg backwards.

Trent looked back straight into the bows of the patrol boat.

Keep your head up and your back straight.

I went to overtake him on the back straight on the last lap.

She held her head erect and her back straight.

Fong squatted on the floor, his back straight, his small hands raised, making quick gestures as he spoke.

Bend your knees, but keep your back straight.

Bend your knees, keeping your back straight.