如果冒险一些说，这个假说是自洽的，并且我不能确定地排除其可能性。
The hypothesis is coherent, if speculative , and I cannot conclusively rule it out.
我不能精准地确定我在那个位置上呆了多久，但我记得的下一件事就是那个幽灵在我眼前消失了。
I am not precisely sure how long I stayed frozen in that position, but the next thing I recall is the apparition vanishing before my eyes.
因此，直到最近发现蜥脚类恐龙筑巢地的化石之前，科学家们还不能确定蜥脚类动物到底是产卵还是胎生。
Until the recent discovery of fossilized sauropod nesting grounds, scientists were thus uncertain whether sauropods laid eggs or gave birth to live young.
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