单词：this once
就这么一回,仅此一次
this once的用法和样例：
例句
- This once beautiful ship is in a sad condition now.那麽漂亮的船现在成了这种样子了。
- This once important social group is becoming more and more marginal (to the way the country is run).这个一度十分重要的社会集团(对治理该国的影响)越来越无足轻重了。
- Be pleasant to each other just this once.彼此要和睦些－－就只为这一次吧。
- Just this once!就这一次吧！