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.
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.
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