人类需要使用工具，因为他们没有像其他食肉动物如狮子和老虎那样锋利的牙齿。
Human beings needed to use tools because they did not have sharp teeth like other meat-eating animals, such as lions and tigers.
他向我如熊埋伏，如狮子在隐密处。
He was unto me as a bear lying in wait, and as a lion in secret places.
因此，我向他们如狮子，又如豹伏在道旁。
Therefore I will be unto them as a lion: as a leopard by the way will I observe them.
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