这纯粹是一种弧形管一段“陷阱”水。
This is simply a curved section of pipe that "traps" water in it.
在氙气灯内，电流通过一个充满气体的显像管，弯曲成弧形。
This is commonly a xenon lamp, in which electricity is arced through a tube filled with the gas.
屋顶结构管桁架相贯连接，呈双向弧形放射状排布。
The structure pipe trusses on the roof are linked together, showing a two-way curved radial arrangement.
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