以前很难确定地质期的持续时间。
The duration of previous geologic periods was difficult to determine.
这是地质学家们很长一段时间以来的普遍看法。
That's been the conventional wisdom among geologists for quite some time.
地质学家怎么会长时间地忽视如此重要的变化过程呢？
How could geologists have overlooked such an important process for so long?
地质学家怎么会长时间地忽视如此重要的变化过程呢？
How could geologists have overlooked such an important process for so long?
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