1.Some species have either been made extinct, or become endangered, because
2.Now, even the very earlist of humans were hunters, since they ate the flesh of
animals and clothed themselves in their skins, and doubtless their hunting gradually contributed to the extinction of some species.
3.However, it was the introduction of guns, with their accurate aim, which put
certain animals at great risk, and from the nineteenth century on, several species were on the brink of extinction.
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3. 然而由於槍枝的引進加上其精準度，致使某些物動物陷於極大的危機，而且從19 世紀起有些物種已經頻臨絕種邊緣。