adj. untraceable
即使数据总数很小，数据工作者也很难追踪数字的变化。
It is difficult for numeric people to keep track of the change in numbers even when the total is very small.
作为海洋中最大的生物，蓝鲸很难追踪，但由于商业捕鲸，它们几乎灭绝，现在已被列为濒危物种。
It is hard to track the blue whale, the ocean's largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species.
我们很难追踪那些口头相传的信息。
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