提示：保持持有队列为空。

Tip: Keep the hold queues empty.

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很难保持有竞争力的定价。

It's hard to maintain competitive pricing.

《柯林斯英汉双解大词典》

然而，当早期的人类第一次开始反思周围事物的本质，他们发现只是为了让思维保持有序也需要有数字的概念。

However, when early humans first began to reflect on the nature of things around them, they discovered that they needed an idea of number simply to keep their thoughts in order.

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