open semicircle

With the blocking idea,the watermark is embedded into the Fourier semicircle region.

该算法基于分块思想将水印嵌入到傅立叶频域的半圆形区域。

double radius button head snap

双半径半圆头铆钉窝子

The half dome over an apse.

穹内半圆顶教堂后部的半圆形穹顶

dangerous sector

危险半圆(北半球危险半圆在风暴轨迹的右边

Woodruff keys--Types and dimensions

GB/T1099-1979半圆键型式尺寸

a semicircle of chairs

排列成半圆形的椅子

(used of the moon) more than half full.

（用来指月亮）大于半圆。

Round head rivets

GB/T867-1986半圆头铆钉

Round head rivets--Black

GB/T863.1-1986半圆头铆钉(粗制)

Cup head nib bolts

GB/T13-1988半圆头带榫螺栓

Cup head square neck bolts

GB/T12-1988半圆头方颈螺栓

strong oval head square neck bolt

加强半圆头方颈螺栓

a theater that offers semicircular seating.

提供半圆形坐椅的剧院

plug-and-feather method

半圆铁棒夹楔劈石法

Stand in a horseshoe facing me.

面向我排成半圆形站着.

Semicircular.Used of bow windows.

半圆的。用于弓形窗

They are sitting in a semicircle.

他们围成半圆形坐着。

precision semi-automatic universal cylindrical grinder

精密半自动万能圆磨床

reentrant cylindrical cavity

圆柱形凹腔, 半同轴空腔