以前很难确定地质期的持续时间。
The duration of previous geologic periods was difficult to determine.
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.
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。
很难确定他的真实动机是什么。
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.
脱离上下文很难确定一个词的意思。
It is often difficult to determine the meaning of a word without a context.
相比相对价值绝对价值很难确定。
It is harder to think about absolute value than relative value.
第三个词可能很难确定，对吧？
很难确定互联网上的消息能否可靠。
It is difficult to know whether the information on the Internet is reliable or not.
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.
很难确定这个词的确切含义。
第三是平滑初始值很难确定。
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.
与这个问题作斗争的进展如何很难确定。
你可能很难确定一个好的。
口语和俚语之间的分界线是很难确定的。
The borderline between informal language and slang is hard to define.
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.
也许这是很难确定的事情，但是值得一试。
说实在的，真的很难确定到底爱不爱一个人。
实际结构的阻尼特性很复杂，也很难确定。
The characteristic of the actual structure damping is quite complicated and also hard to confirm.
有时很难确定你总是给人以好的第一印象。
Sometimes it's hard to make sure that you always give a good first impression.
这很难确定。
由于问题固有的随机性，原因可能很难确定。
The cause might be difficult to determine due to the randomness inherent to the problem.
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.
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.
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