According to the flux, water level, temperature, etc, PLC sends out command to start or stop pumps, and keeps the system in normal operation condition.

PLC根据所采集的流量、水位、温度等条件自动控制开、停泵的台数，以确保清水供水系统的正常运行。

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Recent discoveries have led to advances in how to unleash the immune system, though one challenge has been to jump-start the body's defenses without injury to healthy, normal cells.

WSJ: New Cancer Drugs Use Body's Own Defenses