1·It was awfully hard for Heidi to stop crying when she had once begun, for she cried so seldom.
小海蒂很少哭，但一旦她开始哭，就很难从悲伤中恢复过来。
2·It was evident that she had once been a beauty.
很显然的，她曾经是个美人。
—— 《柯林斯英汉双解大词典》
3·The table had once graced a duke's drawing room.
这张桌子曾一度为公爵的起居室增色不少。
—— 《牛津词典》
4·It had once been the home of a wealthy nobleman.
这曾是一个有钱贵族的宅邸。
—— 《柯林斯英汉双解大词典》
5·The aquifer which had once fed the wells was pronounced dry.
曾经给这些井提供水源的蓄水层已被宣告枯竭。
—— 《柯林斯英汉双解大词典》
6·He had once looked into buying his own island off Nova Scotia.
他曾经考虑过在新斯科舍省沿海购买属于自己的小岛。
—— 《柯林斯英汉双解大词典》
7·Coincidentally, I had once found myself in a similar situation.
碰巧的是，我有一次发现自己曾处于类似的境地。
—— 《柯林斯英汉双解大词典》
8·Eleanor was now less anxious about her offspring than she had once been.
这时，埃莉诺已不像以前那样为子女担忧了。
—— 《柯林斯英汉双解大词典》
9·Not so very hard, after I had once made up my mind that I would learn it.
不那么难，一旦我下定决心后，就能学会它。
10·Two years later, the small restaurant had once again become a big food company, thanks to the businessman's words.
两年后，由于这位商人的话，这家小餐馆再次成为一家大型食品公司。