And the exact contributions of man and nature to the changes taking place are surely unknown, even if it is accepted that man is making natural cycles more pronounced.
自然和人类对变化的确切影响,无疑是未知的,即使在公认人类对自然界循环的影响更加显著的情况下。
But who's to say the trees they chew don't contain some unknown bacterium that stops sheep becoming man-eaters?
但谁又敢说它们咀嚼的树木中也会含有那种防止羊吃人的未知细菌呢?
At Siemens, the 163-year-old industrial symbol of GermanyInc., it was long unknown for a man to take time off for children.
在有163年历史的德国工业象征——西门子公司,很长时间里没有听说有哪位男性为照看孩子而请假。
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