straighten
美 ['streɪt(ə)n] 
英 ['streɪt(ə)n] 
- v.挺直;(使)变直
 - 网络整顿;拉直;弄直
 
第三人称单数:straightens  现在分词:straightening  过去式:straightened  
straighten
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1.  | [t][i] (使)变直,变正to become straight; to make sth straight  | 
I straightened my tie and walked in. 我把领带拉正,走了进去。  | |
The road bends here then straightens out. 公路在这儿拐弯,然后就直了。  | 
2.  | [t][i] 挺直,端正(身体)to make your body straight and vertical  | 
He stood up and straightened his shoulders. 他站起身,挺起肩膀。  | |
I straightened myself up to answer the question. 我直起身来回答问题。  | |
Straighten up slowly, then repeat the exercise ten times. 慢慢挺直身体,然后把这个动作重复十次。  |