The pump and piping are designed to be kept full of water.
水泵和管道在设计上是应该充满水的。
Common type, water accumulated inside equipment and piping, applicable to.
普通型，设备管路中有积水，适用于较温暖的环境。
Why not use the same cheap piping to bring water from streams to crops?
何不使用相同的廉价水管，引水来灌溉农作物呢？
Why not use the same cheap piping to bring water from streams to crops?
何不使用相同的廉价水管，引水来灌溉农作物呢？
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