It is also true that it is difficult to think of a single such system that has not, for better or worse, been substantially modified by human culture.
同样，很难想象一个这样的系统：不管是好是坏，都没有经过人类文化的实质性修改。
You know, I think it's great also in a way because I've been through difficult times and I've worked really hard.
我也曾经历过困难时期，也曾付出极大的努力，但我坚持了下来，我从不气馁。
It's true that we have been leading a difficult life, for we need not only to be under various external pressures, but also to be in the face of internal perplexities.
我们确实活得艰难，一要承受种种外部的压力，更要面对自己内心的困惑。
It "s true that we have been leading a difficult life, for we need not only to be under various external pressures, but also to be in the face of internal perplexities."
我们确实活得艰难，一要承受种种外部的压力，更要面对自己内心的困惑。
He said the AIDS virus, also known as HIV, has been so difficult to stop because it mutates at a dizzying rate.
他表示，艾滋病毒，即人体免疫缺陷病毒非常难以防控，因为它的突变速度快得惊人。
It can also be difficult to find a site and obtain the right permits—one of the reasons why no new refineries have been built in America for over 30 years.
而且选址、拿到生产许可都绝非易事，这也正是为什么30多年来美国没有新的炼油厂出现。
The rise may also be difficult to reverse: the experience of the West has been that the public sector expands relentlessly until it reaches between 40% and 50% of GDP.
规模的扩张也很难扭转：西方的经验是公共领域将在其到达占GDP40%和50%左右之前坚决扩张。
The Mara also offers wildlife in such variety and abundance that it is difficult to believe: over 450 species of animals have been recorded here.
马拉自然保护区生活着的大量野生动物种类达到了令人难以置信的数量，已有记录的动物种类就超过了450种！
Hepatology Digest: It also seems encouraging that sorafenib has shown efficacy in different regions, both east and west. Is that something that has been difficult to demonstrate before?
国际肝病：令人鼓舞的是索拉非尼在不同地区，东方和西方均显示有效。这在以前是很难证明的吗？
We also acknowledge that it has been difficult for newspapers to make money from their online content.
我们也承认，要报纸从它们的网络内容中赚钱是困难的。
It has been quite difficult to find Review Board members with the required qualifications who also would be backed by their companies for the necessary travel and meetings.
并且他们的公司必须支持他们必要的外出开会。寻找这样的审核局成员是非常困难的。
Most users of diesel cold-start interest in the difficult disadvantage, Fukuda has also been completely resolved.
而最受用户关心的柴油机冷起动困难的缺点，也被福田彻底解决。
Biogas warming technology is a research hot spot in fields of biogas science, but also has been a failure to effectively solve the difficult.
沼气增温技术作为沼气科学领域的一个研究热点，也是一直以来未能有效解决的一个难点。
Cook soy milk is not cooked, contained in trypsin inhibitors have not been destroyed, not only difficult to digest soy milk, but also cause nausea, vomiting and diarrhea.
豆浆不煮熟煮透，所含的胰蛋白酶抑制物未被破坏，不仅豆浆难以消化，还会引起恶心、呕吐和腹泻。
Also, the most difficult part, the jumps have to be integrated to the map design and not feel like there has been tiny spots placed everywhere that don't fit the structure.
另外最难的是跳点必须与地图整体设计完美结合，不能让人觉得是在到处乱放与结构无关的东西。
However, as the market turns cold, the buyer has been difficult to accept these bogus sales cost, making a lot of sellers also wait-and-see mood.
但随着市场转冷，买家已经很难接受这些多掏的费用，使得很多卖家也出现观望情绪。
Most of the players have stayed here, we've been through a lot of nice games but also a lot of difficult situations and some little disappointments have stuck us together.
巴拉克说：“这些年来球员们一起经历一起成长，我们获得了更多的经验和自信。大多数主力一直留在这里，我们一起经历了很多很棒的比赛，也一起度过了困难的时期，一起体会失望的情绪。”
But I do not have cosmetic so great power, although had been imperial crown class, although such credence is accumulated, very difficult also one make known to lower levels arrives such quantity.
但是化妆品我没有那么大的力量，虽然已经是皇冠级了，虽然有这样的信用积累，也很难一下达到这样的量。
But it has also been a difficult aspect of physics teaching while abstract physics concepts teaching and learning is a more puzzled problem for the teachers and students.
但是，物理概念教学一直是物理教学中的难点，而抽象物理概念的教与学更是困扰广大师生的一大难题。
Recognition and measurement have been two key difficult issues in financial instruments accounting standards setting, and also two foci of the present research.
本文对金融工具会计准则进行了国际比较，上述问题构成这些国际比较的动因。
Japan's disaster prevention department is also difficult to judge whether the evolution of the volcanic eruption of large-scale violent eruption, but the local residents there have been tensions.
日本防灾部门现在还难以判断，这次的火山喷发是否会演变为大规模的剧烈喷发，但是附近居民已经出现了紧张情绪。
Having been delegated by my company for working in Zhuzhou, Hunan province, several years ago, I got the chance to experience the most difficult but also most enriching time of my life.
自从几年前我被我的公司派到湖南株洲工作，使我有幸经历了人生中最艰难却也是最丰富的阶段。
This problem has been plaguing the industry, organic cotton products are also difficult to sell in the market, a serious problem.
这个问题一直以来困扰着业内人士，也是目前有机棉产品很难在市场上销售的一个严重问题。
This problem has been plaguing the industry, organic cotton products are also difficult to sell in the market, a serious problem.
这个问题一直以来困扰着业内人士，也是目前有机棉产品很难在市场上销售的一个严重问题。
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