Christmass comes but once a year.
圣诞节一年只有一次。
Christmas % es but once a year. But when it es it brings good cheer.
译文：圣诞节一年只有一次，但每次来临都带来喜悦。
Christmas comes but once a year, but when it comes it brings good cheer.
圣诞节每年只有一次，但每次来临都带来喜悦。
Christmas comes but once a year. But when it comes it brings good cheer.
译文：圣诞节一年只有一次，但每次来临都带来喜悦。
At Christmas play and make good cheer, For Christmas comes but once a year.
在圣诞节，好好游戏和欢呼吧，因为圣诞节一年只有一次。
But once a couple is living together, it is harder to split up than if they were merely dating.
但一旦双方住在一起，同当初简单的约会相比，就更难以分开。
I've found email is a good way to initiate contact, but once a conversation starts it's a bad medium.
我发现电子信函是发起联系的好方法，但是一旦交流开始，它就是一个很糟糕的工具。
Most ones that I know have very high ethical standards, but once a VC has heard your idea he can't "un-think" it.
我认识的大多数风险投资人都有很高的道德操守，但一旦风险投资人听到了你的创业点子，就再也无法把它从头脑中抹去。
But once a solid-fuel rocket is ignited, it is off like a firework and keeps going until all the fuel is burned up.
但是一旦固体燃料火箭发动机被点燃，它将象二踢脚一样发射出去并一直跑，直到全部燃料烧完为止。
But once a money is established on the market, then every single exchange includes the money-commodity as one of its two commodities.
而一旦市场里建立起了货币，然后所有的交易都可以简化为“货币——商品”之间的交换，用货币替代另一种商品。
But once a relationship has become long-term, although we still talk about love and commitment, in some ways it's satisfaction that comes to the forefront.
然而一旦交往关系确认成为长期的，虽然我们仍会谈及爱和承诺，对这段关系的满足感却变得重要起来。
For example, I often reward myself on the weekend for a good week of eating healthy and resisting temptations. This is not a daily reward, but once a week.
比如，我会在周末时对自己一周来的健康饮食和控制食欲有所奖赏，这不是每天都有，而是一周一次，同时，我会去跑步（或参加比赛），周日骑单车，整理花园，以此消耗掉周末奖励得来的糖分和脂肪。
But once a craft hits orbit, he says, his new invention makes more sense: The Mini-Helicon Plasma Thruster is designed to be a lighter, cheaper way to move through space.
但是一旦飞船进入太空轨道，他认为他的发明将会更具有现实意义：Mini—Helicon型等离子推进器正是为能更轻巧廉价地在太空飞行而诞生的。
Jupiter, Saturn, Uranus, and Neptune. Those are the gas giants, the four heavyweights of the solar system. But was there once a fifth?
木星、土星、天王星和海王星。这些都是气体行星，是太阳系的四个重量级。但曾经存在第五个行星吗？
Now she attributes much of her understanding of college to that: "But once I got to campus, it was a completely different ball game that no one really prepared me for."
现在她把自己对大学的理解很大程度上归结为：“但一旦我进入校园，一切就完全不同了，没有人真正让我做好准备。”
Andre tells Kim that he once had a sister, but Jack had killed her.
安德烈告诉金姆他曾经有过一个妹妹，但杰克杀死了她。
It may look like a normal yellow bus, but all the magic happens once you get inside.
它可能看起来像一辆普通的黄色巴士，但一旦你进去，所有的奇迹就会发生。
Snow falls as hexagonal crystals, but once on the ground, snow is soon transformed into a compacted mass of smaller, rounded grains.
雪以六角形晶体的形式落下，但一旦落到地面，雪很快就会变成一团更小、更圆的颗粒。
I'm hardly a clotheshorse, but the few new items I buy once again trumped the amount of water flowing from my faucets each day.
我不是一个讲究穿衣的人，但我买的几件新衣服又一次超过了每天从水龙头流出的水量。
I once intended to sell it, but now, I'm thinking of turning it into a guest house, because it's still a solid structure.
我曾经打算把它卖了，但是现在，我想把它改造成一个宾馆，因为它还是一座很坚固的建筑物。
An episode of major depression may occur only once in a person's lifetime, but more often, it recurs throughout a person's life.
重度抑郁发作可能在一个人的一生中仅出现一次，但更经常的是，它在一个人的一生中反复出现。
Sitting in a more comfortable car in a different traffic jam is pleasant but hardly the liberation that once seemed to be promised.
在另一场交通拥堵中，坐在一辆更舒适的车里是令人愉快的，但难以感觉到曾承诺过的那种自由的感觉。
Perhaps that once was true, but today elderly Americans as a group have a lower poverty rate than the rest of the population.
也许这曾经是对的，但是今天美国老年群体的贫困率比其他人群要低。
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。
You once had a chance, but you lost it!
你曾经有机会，但是你错过了它！
It's hard work, but while you are reading, you'll find that what once seemed like a duty is now a pleasure.
这是一项艰苦的工作，但当你阅读时，你会发现曾经被视为一种义务的事情现在变成了一种乐趣。
Once they made him wear a brace but he fretted so he was downright ill.
有一次，他们让他戴上支架，但他焦躁不安，因此病得很重。
After resting for a short time, the boy started once more, but failed again.
休息了一段时间后，男孩又开始了，但是又失败了。
She wore one of his shirts, a shirt that had once been blue but had faded until the color could not be named, and a pair of his breeches.
她穿着他的一件衬衣，这件衬衣曾经是蓝色的，但已经褪得说不上是什么颜色了，还穿了他一条马裤。
She wore one of his shirts, a shirt that had once been blue but had faded until the color could not be named, and a pair of his breeches.
她穿着他的一件衬衣，这件衬衣曾经是蓝色的，但已经褪得说不上是什么颜色了，还穿了他一条马裤。
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