暗能量：这是一个确实奇异的物质形式，或者正是真空本身的属性，特色在于提供了极强的负压。
Dark energy: this is a truly bizarre form of matter, or perhaps a property of the vacuum itself, that is characterized by a large, negative pressure (repelling force).
在设计中将浅埋暗挖技术首次应用于大流量有压输水暗涵，进一步拓展了适用于城市输水工程的工程技术手段。
Shallow buried-tunnelling method was used in the construction of high discharge pressure culvert for the first time and developed a new construction method in urban water distribution project.
采用倒关双密封设计，可带压更换上密封组件，整体阀盖暗杆设计，结构紧凑。
Use back seal design, can replace top seal parts under pressure. Entirety of non-rising bonnet design, have compact structure.
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