参考答案：
1. 事情确实都有例外。(2种译法)
译文1：Indeed, there is an exception for everything.
译文2：There do exist exceptions for everything.
译文3：There is nothing that has no exceptions.
2. 年轻人尊老爱幼是中华民族的传统美德。（2种译法）
译文1：It’s a traditional virtue of China for young people to respect their seniors and take care of their juniors.
译文2：That young people should respect their seniors and take care of their juniors is a traditional virtue of China.
译文3：Young people should respect their seniors and take care of their juniors, which is a traditional virtue of China.
3. 只有3人愿意过如元宵节这样的传统节日。
译文：Only as few as three people are willing to celebrate traditional festivals like Lantern’s Day.
4. 直到失去，才知道珍惜。
译文1: People won’t cherish what they have until they have lost it.
译文2: It is not until they have lost what they have that people will cherish it.
译文3: Not until they have lost what they have, will people cherish it.
5. 正是通过丝绸之路，中国的造纸、火药、指南针、印刷术四大发明才被引介到世界各地。
译文: It was through the Silk Road that the four great inventions of ancient China, namely papermaking, gunpowder, compass and printing, were introduced to the world.
6. 中医是中华文化不可分割的一部分，为振兴华夏做出了巨大的贡献。
译文1: Traditional Chinese Medicine serves as an integral part of Chinese culture, which has made great contribution for Chinese rejuvenation/revitalizing China.
译文2: Traditional Chinese Medicine, as an integral part of Chinese culture, has made great contribution for Chinese rejuvenation/ vitalizing China.
7. 中国是一个历史悠久的文明古国，也是一个充满生机的东方大国。
译文1: China is acknowledged as an ancient civilization with long history，which is also an big oriental country full of vitality.
译文2: China, as an ancient civilization featuring long history，also serves as an big oriental country full of vitality.
8. 奥巴马夫妇什么时候到还是个未知数。
译文:When Mr. and Mrs. Obama will arrive is still unknown.
9. 让他很难适应国外环境的因素是文化而不是语言。
译文1: What/The factor that makes it hard for him to adjust to the foreign environment is the culture rather than the language.
译文1: It is the culture rather than the language that makes it hard for him to adjust to the foreign environment.
10. 今年中欧贸易达到766亿美元，比上一年增长11%。
译文: The Sino-Europe trade volume this year reaches/totals $76.6 billion, which has increased /increasing （by）11% compared to that of the last year.