Back inside, as water rose, Ember quickly built a glass cylinder around the Blue Flame.
店里的水位还在上升，小焰迅速在蓝之火周围建造了一个玻璃筒。
英语百科
Cylinder blown sheet glass
Cylinder blown sheet is a type of hand-blown window glass. It is created with a similar process to broad sheet, but larger cylinders are produced by swinging the cylinder in a trench. The glass is then allowed to cool before the cylinder is cut. The glass is then re-heated and flattened. The result is much larger panes and improved surface quality over broad sheet.