once表達曾經可以放在句首嗎

once表達曾經可以放在句首

也可以用Once upon a time

Once they lobbied hard to join nato .

他們曾經極力遊說以加入北約。

Globular clusters once ruled the milky way .

球狀星團曾經統治着銀河系。

Do this about once a week .

油大概每週上一次。

I was in this exact situation once .我曾經歷過一模一樣的情形。

We cannot take back words once spoken .

話一旦說出我們不可能收回。

Once upon a time there was a beautiful girl who lived in a big castle.

很久很久以前，有個漂亮的小女孩兒住在一座大城堡裏。