当然，甚至在科学中，有时候我们自己没有发现证据，并且我们要接受别人说的东西。
Of course, even in science, sometimes we haven't seen the evidence ourselves and we have to take somebody else's word for it.
科学家在《科学》期刊上写道：“有些物种，甚至在科学界知道它们之前可能就已经绝迹了。”
"Species may be vanishing even before they are known to science," the scientists write in the journal.
一项对全球野生动物的大规模年度调查表明，近四分之一的陆地哺乳动物物种濒临灭绝，还有许多其余的物种，甚至在科学界知道它们之前可能就已经绝迹了。
Nearly a quarter of the world's land mammal species are at risk of extinction, and many others may vanish before they are even known to science, according to a major annual survey of global wildlife.
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