Even the earliest of tribes had a system of numeration that, if not advanced, was sufficient for the tasks that they had to perform.
即使是最早的部落也有一种计算系统，哪怕不先进，也足以完成他们必须执行的任务。
Only humans and chimps, she said, had a system of communication where they deliberately sent a message to another group member.
她说，只有人类和黑猩猩有一个交流系统，会有意向另一个群体成员发送信息。
But we didn't have to deal with all those issues until we had a system that worked, and so far, we didn't.
但是在拥有一个行之有效的体系之前，我们不必为这些事情烦心，况且目前我们确实没有。
But we didn't have to deal with all those issues until we had a system that worked, and so far, we didn't.
但是在拥有一个行之有效的体系之前，我们不必为这些事情烦心，况且目前我们确实没有。
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