The duration of previous geologic periods was difficult to determine.
以前很难确定地质期的持续时间。
With such a long interval, it is difficult to determine the age of this fossil.
时间隔得这么久了，很难确定这化石的年代。
Outsiders may then find it difficult to determine your contributions and strengths.
局外人可能会很难确定你的贡献和优势。
Halley realised that Mercury was so far away that its parallax angle would be very difficult to determine.
哈雷意识到水星离地球如此之远，以至于很难确定它的视差角。
Difficult to determine information completeness.
难以确定信息的完整性。
The death toll in Libya has proved particularly difficult to determine.
利比亚的死亡人数尤其难以确定。
A precise definition of poverty is actually very difficult to determine.
对贫困的精确定义实际上是很难的。
It is very difficult to determine the cause of a problem that only occurs sometimes.
只有偶尔会发生的问题是很难确定问题的起因的。
This approach makes it difficult to determine missing files or correct versions.
这种方法使得确定丢失的文件或修正版本极为困难。
It's not difficult to determine that these two crashes have the same root cause.
不难判断这两个崩溃的原因是相同的。
It is difficult to determine from an interview whether someone is type a or not.
面试很难区分出某个人到底属于A类还是B类。
Also, many electronic devices are locked, making it difficult to determine who owns them.
许多电子产品都是锁着的，为确定失主带来困难。
Too many asserts can make it difficult to determine exactly which assert caused the error.
太多的断言会使我们很难判断错误是由哪个断言引起的。
It is sometimes difficult to determine the right thing to do, but many firms are trying.
有时很难决定怎样做才对，但是许多公司在努力做好。
It is difficult to determine malignancy in endocrine neoplasms based upon cytology alone.
仅从内分泌肿瘤的细胞学检查很难确定为恶性。
Out of so many available software packages, it can be difficult to determine which one is best.
由于有这么多可用的软件包，因此很难确定哪个最好。
It can be difficult to determine where and when performance problems and bottlenecks occur.
很难确定何处、何时会出现性能问题和瓶颈。
With zinc, there is so little research that it is difficult to determine zinc's effect on a cold.
目前针对锌片预防感冒效果的研究寥寥无几，以至于很难判定其是否有效。
It's even more difficult to determine the value of mobile design for small sales-focused websites.
手机访问页面对于小型销售导向网站的价值更难判断。
If you don't know what you want, it will be difficult to determine whether your work is finished.
如果不知道自己的需求，则难以确定工作何时完成。
Jobs stressed that it was difficult to determine how the economic downturn would affect Apple's sales.
乔布斯强调，经济不景气是否会影响苹果的销售，这还是一个很难确定的判断。
It can be difficult to determine which work-related contacts to connect with and what content to share.
很难决定和哪个与工作相关的联系人联系，也很难决定哪些信息可以分享。
Stores multiple versions of information, making it difficult to determine which information source to use.
存储多个版本的信息，很难确定该使用哪个信息源。
If you change the process, it is difficult to determine all of the places in the document that need to be updated.
如果更改流程，则很难确定文档中需要更新的所有位置。
Buildings collapsed and phone lines and electricity were down, making the extent of the damage difficult to determine.
地震造成大楼倒塌，电话线和电力中断，造成的巨大损失无可估量。
In fact, for some repositories, it can be difficult to determine what exactly is going to map to the Repository object itself!
事实上，对于某些存储库而言，会难以确定完全映射在Repository对象本身上的是什么！
If there is not the accurate match method, it is very difficult to determine some chromatograph peak represents what material.
如果没有准确的匹配方法，就很难确定某个色谱峰代表何种物质。
If there is not the accurate match method, it is very difficult to determine some chromatograph peak represents what material.
如果没有准确的匹配方法，就很难确定某个色谱峰代表何种物质。
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