Let people go back aboriginally using knotted ropes for simple reckoning.
使新回归到绳记事的代。
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That many breeds produced by man have to a large extent the character of natural species, is shown by the inextricable doubts whether many of them are varieties or aboriginally distinct species.
人类培育出的许多品种在很上具有自物种的特,点可以从无法摆脱的疑问中看出, 其中许多品种是变种还是原始独特的物种。
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