I only saw her once during my stay in Rome.
我在罗马逗留期间只见过她一次。
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。
I never thought she'd win once, never mind twice!
我还以为她一次都赢不了，更别说两次了！
An opportunity like this comes once in a lifetime.
像这样的机会一生也许只会遇到一次。
We water the flowers once a week.
我们每周给花浇水一次。
We have to water this cactus once a month.
我们必须每月给仙人掌浇一次水。
Reputation is a treasure that, once lost, can never be won back.
名誉如同珍宝，一旦失去，再难获得。
I once had a dream, in which I saw rice plants as tall as sorghum.
我曾经做过一个梦，在梦里水稻和高粱一样高。
Her kind neighbors once helped her out when she was in big trouble.
她善良的邻居们曾经在她遇到大麻烦时帮助过她。
I truly believe that once you get that first word out everything else will just flow.
我真的觉得，一旦你开口说出了第一个字，其他的一切都会水到渠成。
It made a refreshing change to be taken seriously for once.
总算有一次受到认真对待，这变化真是令人耳目一新。
The spirit of adventure rose in the boys' souls once more.
冒险精神再次在孩子们的心中油然而生。
大门立时洞开。
我们马上出发吧！
It is once again the 7-day National Day holiday.
又到7天国庆长假了！
"No, no, dear child," he said affectionately, "not at once."
“不，不，我亲爱的孩子，”他深情地说，“现在不行。”
But she's a quick study. She sees a thing once and remembers it.
但是，她是个学得快的人。她过目不忘。
Oh, I long to hear her voice once more!
啊，我真想再听到她的声音！
良机难再。
Rules and regulations, once set up, should not be turned into a dead letter.
规章制度一经订立，不应成为一纸虚文。
何不再试一下？
The teacher's words made me at once become enlightened.
老师的一席话使我顿开茅塞。
I recognized her voice at once.
我立刻听出了她的声音。
No man can do two things at once.
一人不能同时做两件事；心无二用。
Why not seize the pleasure at once?
“何不立刻把握快乐？”（有花堪摘直须摘）
Yes, he once gave her seven roses.
对，有一次他送给她七朵玫瑰花。
Yes, he once gave her seven roses.
对，有一次他送给她七朵玫瑰花。
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