Technical challenges remain, including integrating a leakproof backup battery into the device and miniaturising the FREE-D’s control electronics.

存在的技术难题还很多，包括将一个防漏电的备用电池集成到心泵内，还有缩小FREE-D电子元件的体积。

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All awl tube thread pre-coated PTEF leakproof gum, with excellent sealing property.

所有锥管螺纹预涂聚四氟乙烯防漏胶，密封性能好。

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According to technical requirements of filming plastic sheet for leakproof saline, a soil cutting and throwing device was developed.

根据盐田防渗塑膜铺底所需覆土量的技术要求，设计了盐田防渗塑膜铺底专机(简称：盐田铺膜机)的切抛土部件。

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Lastly, it needs to be covered with a layer of non-porous, non-cracked rock to provide a leakproof cap.

ECONOMIST: A survey of The future of energy: Dig deep | The

Even his disciplined, near-leakproof campaign organization seemed a total contrast to the freewheeling, chaotic image of the Clinton effort.

CNN: Analysis: Why Clinton's bid failed

It is not necessary for such a system to be leakproof.

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