脑脊液保护着神经组织，维持着它的健康，并去除废弃产物。

This fluid helps protect the nerve tissue, keep it healthy, and remove waste products.

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物流可以分成供应物流、生产物流、销售物流、回收物流和废弃物物流。

Logistics may be divided into supply logistics, production logistics, distribution logistics, returned logistics and waste material logistics.

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工业企业物流系统由生产物流、供应物流、销售物流及回收废弃物流等子系统组成。

Industrial enterprise logistics system makes up by the subsystem of production logistics, logistics of supplying, sell logistics, retrieve and discard logistics.

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