Heat input by direct steam injection is more efficient than indirect heating and, in addition, the PDX unit is an hygienic, "clean bore”pipe fitting that requires very little cleaning.
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Full bore pipeline ball valves the channel diameter and the same diameter, only a small fluid resistance, but also easy to clean pipes.
全通径球阀的通道内径与管线内径一致，不但流体阻力小，也便于管道清理。
On that trip, in a small community, I met a girl and walked with her to a nearby bore well where she could get clean water.
那次旅途中，在一个小型社区里，我遇见了一个女孩，和她一起去附近的一个钻井汲取干净的水源。
He bore in his hand with grace a notebook, new, large, clean, bright.
他手里文雅地拿着一本又新又大、洁净而颜色鲜艳的笔记本。
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