1·This led to the construction of earthen or stone steps, arranging the audience into a semicircle in front of the speaker.
这导致了泥土阶或石阶的建构，安排观众们面对讲演者坐成一个半圆形。
2·An air bubble ascending from the ocean floor contorts and twists into a semicircle as a wave breaks in the background.
当波浪在背景中破碎时，从海底升起的气泡扭曲成半圆形。
3·An air bubble ascending from the ocean floor contorts and twists into a semicircle as a wave breaks in the background.
当波浪在背景中破碎时，从海底升起的气泡扭曲成半圆形。
4·It's called the Ring of Fire, a semicircle of violently shifting plates and volcanoes that runs along the edges of the Pacific Ocean.
这里被称为火圈带，一个由剧烈移动的板块和火山组成的半圆形区域，分布在太平洋沿岸。
5·But when the sun, the South there is a semicircle.
可是艳阳的时候，南方出现了一个半圆形。