Hold your head up and keep your back straight.
请把头抬起来，腰直起来。
answered he, raising himself from his stooping posture.
他直起腰来回答说。
Everybody breaks up over it.
人人都笑得直不起腰来。
He bent double with explosive laughter.
他大笑得直不起腰来。
be doubled up with laughter, pain, anger, etc
笑、 痛、 气...得直不起腰.
He was tall with a neat, erect carriage.
他个子高而腰背挺直。
He straightened his back and braced his shoulders.
他挺直腰板，收紧肩膀。
The students bowed their heads on their knees in excess of joy.
学生们乐得直不起腰来。
Her legs began to tire and she wanted to get up and stretch.
她的腿开始疼了，她想站起来，直一直腰。
The heavy bundle bore him down.
那包东西很重，压得他直不起腰。
With a sigh, she straightened in her chair and stretched.
她叹了口气，在椅子里坐直，伸了伸腰。
He straightened up, wiping his hand on his trousers.
他直起腰来，把手在裤子上擦了擦。
All that heavy lifting have give me a pain In the back
我一直抬那些重东西, 现在腰都痛了
They leant against the table, doubled up with laughter.
他们靠在桌子上,笑得直不起腰.
George drew himself up, and smiled disdainfully.
乔治挺直了腰杆，毫不在意地笑着。
Dilcey was tall and bore herself erectly.
身材高大迪尔茜的腰背挺直。
His body had straightened, and seemed to have grown bigger.
他的腰板挺直，个子也似乎高大了一些。
the old man still walks erectly.
这位老人仍然能挺直腰板走路。