美国各地许多城镇已经开始在其现有污水处理系统当中采用这种覆有细菌生物被膜的半圆形设备。
Several towns nationwide have started using the domes lined with bacterial biofilm to clean water in existing facilities.
东方和西方的的拱形延伸着，被巨大的半圆顶屋支撑着，而另一半圆顶屋就依次延伸到更小的半圆形屋顶的开敝式有座谈话间上。
The arches at the east and west are extended and buttressed by great half domes, while the half domes in turn are carried on smaller semidomed exedrae.
它通常是有馅的半圆形的麦制食品。
柱子后面是掘好的一个大坑，边沿有新垒起的泥土，土坑和柱子附近，呈半圆形站着一大群人。
A big pit had been dug out near the post, and the freshly turned-up earth was heaped up by it. A great crowd of people formed a semicircle about the pit and the post.
一侧有爪，呈龙骨瓣三角状半圆形。
Claw on one side, showing triangular-shaped semi-circular keel.
前翅狭长，前缘中央有一白色半圆形斑，翅顶有一暗褐色斜线。
Before long, narrow, and the central front wing a white semicircle spot, wing top have a dark brown diagonal lines.
前翅狭长，前缘中央有一白色半圆形斑，翅顶有一暗褐色斜线。
Before long, narrow, and the central front wing a white semicircle spot, wing top have a dark brown diagonal lines.
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