It is known as the music room because once it was used for music lessons.
它被称为音乐室，因为它曾用来上音乐课。
People usually draw the curtains once it gets dark.
天一黑，人们通常就会拉上窗帘。
But once it generates positive cash flow, the story can change.
但一旦产生正向现金流，情况就可能发生改变。
But once it is, I think you'll be very pleased with the result.
但是一旦实现，我想您将对这个结果非常满意。
Nothing can persuade her to change her mind once it is made up.
一旦她下定决心就没有什么可以说服她改变注意。
但这已经是过去的事了。
Of course I knew at once it was just a terrible mistake.
当然了，我一眼就看出，这是一个很糟的误会。
Treatment of tail biting is difficult once it has started.
一旦出现尾部受伤，处理就比较困难。
It is no use trying to catch up with the train once it starts.
当火车启动时，设法赶上那趟车是徒劳的。
No film maybe withdrawn once it has entered the selection process.
影片一旦进入筛选过程就不能退出。
For once it is Mr Cameron, not Mr Clegg, who has the bigger headache.
这一次，头疼的不是克莱格，而是卡梅隆。
China is a sleeping lion, once it wakes up, it will shake the world.
中国是一头睡狮，一旦醒来将震憾世界。
The trouble is once it went international, the troubles started coming in.
他说，问题在于一旦它走向世界，麻烦也就接踵而至了。
There are three methods for starting a game once it has been installed.
如果游戏已经安装好了，有三种方法来开始游戏。
He said this so naturally that I was sure at once it was absolutely true.
他的话那么自然，以至于我马上相信这会是真的。
Freezing meat once it is home from the supermarket could kill deadly bugs.
一回家就把从超市买的肉制品冷冻起来可以杀灭其中致命的病菌。
A good opportunity appears only once; once it is lost, it will never return.
良机只有一次，一旦坐失，就再也得不到了。
Health is very important for everyone, for once it is lost, it can hardly come back. Since health is so important, how can we keep healthy?
健康对每个人来说都是非常重要的，一旦失去了，它几乎不能回来。因为健康是如此的重要，我们怎样才能保持健康呢？
Once it is seen, it can never be forgotten.
这东西一旦看到一次，就永远也忘不了。
Once it had collected every jewel, it flew away.
当小鸟把所有的珠宝都收集完，它便飞走了。
Once it is authenticated the project is checked out.
一旦验证通过，项目就被检出。
Once it is decided, no change shall be made arbitrarily.
但一经确定，不得随意变动。
Once it is heated, the amber can be made into any shape.
琥珀一旦加热，就可以被制作成各种形状。
Once it is published, the dictionary will be very popular.
一旦出版，这本词典将大受欢迎。
Once it was safely inside the euro, indeed, Greece relaxed its fiscal grip.
希安然加入欧元区后，确实放松了其财政控制。
Once it is set up correctly, the configuration should look similar to Figure 1.
正确设置之后，配置应该与图1类似。
Once it is set up correctly, the configuration should look similar to Figure 1.
正确设置之后，配置应该与图1类似。
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