他们知道一个由优秀的沟通者组成的有凝聚力的团队对于提高企业的运营效率和生产力有着不可替代的作用。

They know a cohesive team composed of great communicators plays an irreplaceable role in enhancing the operational efficiency and productivity of an enterprise.

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所以真正重要的是其他睡眠阶段是否有不可替代的作用？

So the real question is how critical those other phases of sleep are. Do they yield any irreplaceable benefits?

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我们养宠物，这些宠物是一种奇怪的混合产物(人们喂养猫猫狗狗是为了有个伴)，它们替代了人的作用，且成为人们通向自然界的管道。

We keep pets, which are a weird combination of constructed things (cats and dogs were bred for human companionship), surrogate people and conduits to the natural world.

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