以前很难确定地质期的持续时间。
The duration of previous geologic periods was difficult to determine.
局外人可能会很难确定你的贡献和优势。
Outsiders may then find it difficult to determine your contributions and strengths.
时间隔得这么久了，很难确定这化石的年代。
With such a long interval, it is difficult to determine the age of this fossil.
他注意到这项研究的局限性，比如很难确定自杀行为原因。
He noted limitations to the study, such as the inability to determine the cause of the suicidal behavior.
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。
Halley realised that Mercury was so far away that its parallax angle would be very difficult to determine.
研究这一问题的人说，这很难确定，因为许多日本夫妇在接受调查时，称他们的婚姻是爱情的结合，即使是包办的婚姻。
It's hard to be sure, say those who study the matter, because many Japanese couples, when polled, describe their marriage as a love match even if it was arranged.
很难确定一个准确的数字，因为各家公司不愿公布它们的亏损情况。
It is difficult to quantify an exact figure as firms are reluctant to declare their losses.
失败的原因很难确定。
很难确定何处、何时会出现性能问题和瓶颈。
It can be difficult to determine where and when performance problems and bottlenecks occur.
这对股票市场来说，很难确定。
奥巴马先生的观点则很难确定。
很难确定这些伤是否和他的死亡有关。
It was unclear whether those injuries were linked to his death.
只有偶尔会发生的问题是很难确定问题的起因的。
It is very difficult to determine the cause of a problem that only occurs sometimes.
但是这些评论很难确定并且争议性都很大。
But the observations are difficult to make and highly debated.
存储多个版本的信息，很难确定该使用哪个信息源。
Stores multiple versions of information, making it difficult to determine which information source to use.
使用传统技术则很难确定应该将哪些更改提醒给用户。
With traditional techniques, it is not easy to determine which changes should be prompted to users.
说实在的，真的很难确定到底爱不爱一个人。
经证明很难确定先前未知的抗菌素作用靶位。
The identification of previously unknown target sites for antimicrobial action has proved difficult.
这很难确定。
如果更改流程，则很难确定文档中需要更新的所有位置。
If you change the process, it is difficult to determine all of the places in the document that need to be updated.
第二，有时候很难确定某论证过程是否是谬误。
Second, it is sometimes hard to evaluate whether an argument is fallacious.
很难确定哪些MQ应用程序与某个特定代理关联。
It is difficult to identify which MQ application a particular agent is associated with.
当然，在某些情形下，很难确定怎样就构成了虐待。
Of course, in some situations, it can be tough to figure out what constitutes abuse.
由于有这么多可用的软件包，因此很难确定哪个最好。
Out of so many available software packages, it can be difficult to determine which one is best.
的确，在整个国家或一个州内变性人的数字很难确定。
Indeed, the very number of transgender people in the country and the state is hard to pin down.
但他说，很难确定哪一个问题先出现——记忆力衰退或口腔疾病。
But he says it can be hard to determine which problem comes first - memory loss or diseases in the mouth.
你很难称他们为赢家，当然，也很难确定他们会失去多少。
You can hardly call them winners, of course, but it's not yet certain just how much they may have lost.
传闻在网络上迅速传播，已经很难确定哪些是事实哪些仅仅是揣测了。
With rumours on the Internet spreading like wildfires, it has been very difficult to ascertain what is real and what is just speculation.
丛林荒野最糟糕的部分之一是植被密度，使你很难确定方向。
One of the worst aspects of a jungle wilderness is the density of the vegetation, making it difficult to get your bearings.
丛林荒野最糟糕的部分之一是植被密度，使你很难确定方向。
One of the worst aspects of a jungle wilderness is the density of the vegetation, making it difficult to get your bearings.
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