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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