Sit in a chair with your back up.

把腰挺坐好。

You have to keep your head very still？

您是是还得挺脑袋？

Keep your back straight and don't move around too much.

保持部挺，常常四处移动。

An old man with a very straight back sat at the Star Table.

一位腰板挺老者坐在星际会议桌旁。

And if I straighten up my back, I can even get more.

如果我挺，我甚至可以更高。

'Cause I always made sure I had a straight back.

因为我总是确保我有挺。

Dilcey was tall and bore herself erectly.

身材高大迪尔茜腰挺。

Madame Maxime had drawn herself up to her full, and considerable, height.

马克西姆夫人挺她魁梧高大身躯。

He got to his feet and stretched.

他从秋千上下来站到地上，挺身体。

Shake out the legs, wiggle your fingertips and toes and come to flat back position.

摇晃双腿，扭动指尖和脚趾，然后挺部。

At the gate, I paused to watch as she straightened up to catch her breath.

我停在大门口，看她挺身子喘气。

As soon as Nancy heard it, she sat up in her chair.

南希一听见这声音，立刻在椅子上挺了身子。

It's best to have your spine reasonably straight, which may help prevent an involuntary nap.

脊柱最好保持挺，这有助于防止自觉睡着。

But there, squaring her shoulders, lifting her chin, she shrugged her helpers off.

刚一站定，她就挺脊，抬高下巴，谢绝了旁人搀扶。

Keep your knees straight and touch the ground with your ears! called Charlotte.

“膝盖挺，把你耳朵碰到地面！”夏洛叫道。

Tall and rather thin but upright, the Director advanced into the room.

主任往屋里走去。他身材修长，略显瘦削，身板挺。

Try to sit back into the hip of your standing leg and keep your chest up.

尽量坐在站立腿臀部上，并保持胸部挺。

Stand up or sit down in a comfortable position (keeping your back straight, though).

以舒适姿势站立或就坐（当然，保持部挺）。

Karkaroff straightened himself as best he could, tightly bound to the chair.

卡卡洛夫尽可能挺身体，他被紧紧绑在椅子上。

He was a fine man, with straight, strong limbs, tall and young.

他是一个很好人，四肢挺有力，又高又年轻。