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.
First of all, it's really hard to figure out where everything is, where everything goes, making sure I'm in the right place.
第一,很难判断事务的位置,事物的走向,还有确定自己处于正确的位置。
That's a quite difficult argument to pin down does it work or does it not work.
这个论证很难确定,是不是说得通。
You'd be hard pressed to identify what the meter of that is so that's one reason, and of course what--where am I going with the next important point about what's happening in this music?
你会很难确定其中的节拍,这也是原因之一,当然这也是我将要讲解的下个关键点,关于在这类音乐中的情形
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