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。

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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。

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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。

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It is difficult to determine an exact number because of a lag time in official counts and differences in the states' standards.

CNN: Northwest heat endangers crops

In addition, it is difficult to determine with certainty that early whether a baby is HIV-positive, and overtreatment would risk wasting scarce medications that offer a better chance of helping other patients.

WSJ: Baby Cured of HIV for the First Time, Researchers Say

While experts said it is difficult to determine how many people belong to hate groups, they do agree with an SPLC estimate that claims there are about 900 operating now, a 40 percent increase from 2000.

CNN: White supremacists watched in lead up to Obama administration