But these cells were less origin and too difficult to obtain, and it could t achieve ideal results in old patients and in that which periodontal tissues was defect seriously.
但以上细胞取材困难，来源少，对于老年人牙周病及牙周组织大面积缺损的病人难以达到理想的效果。
Google and Apple have made it far too difficult to adjust these settings so it's up to us to take steps to ensure we set these triggers to suit our own needs, not the needs of the app makers.
谷歌和苹果公司已经让调整这些设置变得非常困难，所以由我们决定采取措施来确保我们设置这些触发器符合我们自己的需求，而不是应用程序制造商的需求。
Google and Apple have made it far too difficult to adjust these settings so it's up to us to take steps to ensure we set these triggers to suit our own needs, not the needs of the app makers'.
谷歌和苹果公司已经让调整这些设置变得非常困难，所以我们应该采取措施确保我们设置这些触发器是为了满足我们自己的需求，而不是应用程序制造商的需求。
Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior.
给它安装无线电设备是很困难的，而且仅凭肉眼观测也太不可靠，无法对它的行为进行确切的观察。
When faced with difficult situations in their lives, many people find them too challenging and give up, especially on their life dreams.
当面对生活中的困境时，很多人觉得它们太具有挑战性而放弃了，尤其是在人生梦想上。
The rest is far too difficult to extract and has to remain underground.
其余的石油则难以开采，它们不得不留在地下。
At times it seems too difficult and too far out of reach.
有时它似乎太困难，太遥不可及。
Many local farmers said their sheep and cows would die after eating the plastic bags and it was too difficult to clean them up.
许多当地农民表示，他们的牛羊吃了塑料袋后会死去，而且它们很难清理。
Sometimes your partner talks too fast and you find it difficult to follow.
有时你的伴侣说得太快，你很难听懂。
There were two things that he thought were too difficult for him—the grammar and some of the idioms.
他认为有两件事对他来说太困难了，一是语法，二是一些习语。
Sometimes the goal of fluency in a language seems too far off, and difficult to envision if you have never done it.
有时候，流利地说一种语言的目标似乎太过遥远，如果你从来没有做到过的话，那个目标也很难想象。
Again, notice that you need to be creative when using Fibonacci sequence in your designs, otherwise your designs will turn out to be too rigid and hence difficult to use and navigate.
再次要重申的是，在设计中使用斐波那契序列时需要保持创造性，否则你的设计将显得僵硬并且难以使用和导航。
The smaller the better, because habit change is difficult, and trying to take on too much is a recipe for disaster.
越小越好，因为要改变习惯很困难，企图一口吃个胖子是制造灾难的良药。
It will probably prove too difficult and expensive to fit CCS to plants nearing the end of their lifespan.
给即将寿命终了的电厂安装CCS设备可能会被证明太困难也太昂贵。
The oil was once considered too difficult and expensive to extract as it is a mixture of clay, water and bitumen.
之前这里的石油被认为太难开采，因为油层中粘土、水、沥青混在一起。
Although Mougin initially received backing from a Saudi prince, experts told him that the project was too difficult and too expensive.
虽然这个想法起初得到了沙特王子的支持，但专家认为要实现这项工程困难重重，并且费用极高。
And they argued that the cost of setting up a tracing regime would be too difficult and expensive.
他们还说，建立追踪系统非常困难，成本也很高昂。
It was too difficult for him and the experience was bad.
太难了，整个经历的感觉都不好。
The fundamental problem is that extending the browser, and hence the web, is too difficult.
扩展浏览器以致网络,太困难了.
It would be much too big and difficult to maintain.
这将使维护工作繁重而困难。
Most companies start out trying to do too many things, which makes life difficult and turns you into a me-too.
大部分的公司在开始创业的时候都做了太多烦琐的事情，这样只会使你的生活变得更加的烦琐，变成另一个像我一样过着烦琐生活的人，将注意力集中在处理一些小事情上有许多的好处——这样你就没有那么多的工作去做，你可以将你手头上的事情做到最好。
When you add the words I love you to actions and thing the children do to make it all too difficult.
当你把我爱你这三个字加入到行为和具体事件上时，孩子们可能会把它变得很不自然。
The templates will be too complex and will become difficult to update very quickly.
那样的模板将会过于复杂，而且将变得难以非常迅速地更新。
Hang on, that is not too difficult, after all, these people are bloggers too and they are also here to learn and meet other bloggers.
坚持一下，并不困难，毕竟，这些人也是写博客的，而且他们也是来这里学习和认识其它博主的。
If people fail to understand some of their rights and obligations, perhaps the sentence structure is too difficult.
如果人们无法理解他们的某些权利和义务，或许是句子结构有问题了。
However this too can be difficult to get right and it only takes one mistake to disrupt all of the following tests.
但是，这也不是那么好做的，只要一个错误就能中断接下来的所有测试。
Graphics can communicate complex relationships and ratios in a way that is too difficult to do with plain text.
对于那些复杂的关系和比例，纯文本是很难表达的，图形是一种很好的沟通的方式。
Graphics can communicate complex relationships and ratios in a way that is too difficult to do with plain text.
对于那些复杂的关系和比例，纯文本是很难表达的，图形是一种很好的沟通的方式。
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