this once的用法和樣例：
例句
- This once beautiful ship is in a sad condition now.
那麼漂亮的船現在成了這種樣子了。 - This once important social group is becoming more and more marginal (to the way the country is run).
這個(gè)一度十分重要的社會(huì )集團(對治理該國的影響)越來(lái)越無(wú)足輕重了。 - Be pleasant to each other just this once.
彼此要和睦些－－就只為這一次吧。 - Just this once!
就這一次吧！
