A hundred years ago coronary heart disease was virtually unknown in America.
100年前，冠心病在美国几乎从未有过。
Small-minded officials, rude waiters, and ill-mannered taxi drivers are hardly unknown in the US.
在美国，心胸狭窄的官员、粗鲁的传者和没有礼貌的出租车司机也并不少见。
Calculate the unknown in the following.
试求出下面的未知数。
Or be the first to find a common species unknown in your area.
或者，你也可能成为你所在区域里第一个发现某个普通品种的人。
Their brands, though well established at home, are unknown in Europe or America.
他们的品牌虽然在国内享有很高的知名度，但在在欧美却默默无闻。
On the road, not for travel, not for someone, only to meet the unknown in the unknown.
在路上，不为旅行，不因某人，只为在未知的途中遇见未知的自己。
Or what of "roue", a "French" word common enough in English but now almost unknown in French?
另外，在英语中普遍使用的一个法语单词“roue”但是现在在法语中已经几乎不为人知了，那它是否也应该计入呢？
"You type:" Go north, "and you exit through the tunnel on your way into the unknown in the next room."
你输入：“往北走”，然后你就走出了这个房间，通过一个通道，走向另一个房间中的未知。
This is especially significant for use-when, which was unknown in 1.0 and is a standard attribute in 2.0.
这一点对 use-when特别重要，1.0 处理程序不能识别它，在 2.0中成了标准属性。
Corporate America has long complained about swingeing punitive damages, unknown in the rest of the rich world.
一直以来美国大公司都对惩罚性赔偿愤愤不平，称这在其他发达国家中闻未所闻。
Before Columbus, the parasites that cause malaria were rampant in Eurasia and Africa but unknown in the Americas.
在哥伦布踏上北美大陆之前，导致疟疾在欧亚大陆和非洲大陆横行泛滥的寄生虫在美洲大陆并未现身。
Until the 18th century the technology for making porcelain was unknown in Europe and what there was had all been imported.
到十八世纪为止，欧洲人对瓷器的制作工艺还一无所知；如果那个时候有人在欧洲看到瓷器，那它们肯定都是进口货。
The baiji was unknown in the West until 1918, when the 17-year-old son of a missionary shot and killed one while duck hunting.
1918年一位牧师17岁的儿子在打鸭子时开枪打死了一只白暨豚，从此它才在西方世界为人知晓。
Gay Palestinians have long been sneaking into Israel to enjoy a freedom unknown in their own, much more conservative, society.
巴勒斯坦的社会气氛总是相对保守，所以那里的同志们一直偷偷溜到以色列去享受一番自由空气。
Diesel engines are almost unknown in emerging markets other than India because poor-quality diesel fuel is associated with trucks.
柴油引擎在新兴市场除了印度外几乎没人知道，因为质量低劣的柴油与卡车联系在一起。
“Human beings have trouble coming to terms with the unknown, ” Mr. Taylor said. “Growing old is a great unknown in the lives of everyone who is not yet old.”
“人类对于未知的情境总是存在忧虑”Taylor先生说，“对于尚未变老的人来说，变老是生活中一个巨大的未知。”
But they are so far unknown in Britain, chiefly because prenuptial agreements have had little legal force in English law (Scotland’s legal system is separate).
然而，到目前为止，这些策略在英国还是不被人知的，主要是因为这些婚前协议在英国法律（苏格兰法律除外）面前是几乎没有法律效力的。
At the end of each hour after you have estimated its usefulness, imagine that you just woke up in the absolutely unknown in comparison to the previous one gone by.
在每一小时的结束而经过你评估它的有效性之后，想象一下你才刚在完全的无知当中(和之前刚过去的一小时相比)醒过来。
Listed as near threatenedby the International Union for Conservation of Nature, the deep-seaspecies native had previously been unknown in Greenland waters, the newreport says.
国际自然保护联盟将这个深海物种列入近危名单，新的报告称，英格兰水域以前从未发现过这个深海物种。
It will also control the warehousing and inspection of goods. An electronic signature system, unknown in Ethiopia's backward banking scene, will settle transactions by the end of the day.
此外，它还将对粮食入库和检查实施监控，一个电子签名系统（在落后的埃塞俄比亚银行业内这可谓闻所未闻）会在每天结束时对交易情况进行最后认定。
In Juan's world, the unknown and undiscovered was vast and marvelous.
在Juan的世界里，未知和未被发现的东西是广阔而不可思议的。
A real and pressing issue is that many plant species have not yet been cataloged, and so their place in the ecosystem is unknown.
一个现实而紧迫的问题是，许多植物物种还没有被编目，因此它们在生态系统中的位置是未知的。
Mikoshi-nyudo's true identity is unknown, but in some areas, he is believed to be a shape-shifting weasel, fox or tanuki.
见越入道的真实身份仍是未知，但有些地区的人们相信他是由黄鼠狼，狐貍或貍变的。
Mikoshi-nyudo's true identity is unknown, but in some areas, he is believed to be a shape-shifting weasel, fox or tanuki.
见越入道的真实身份仍是未知，但有些地区的人们相信他是由黄鼠狼，狐貍或貍变的。
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