螺旋瓣

出膜后9d左右时，瓣肠内螺旋瓣的数目增多，肛门和直肠形成；

In the 9 ~ ( th ) day , the number of spiral valve in valvula intestine increased , the rectum and anus appeared .

中国软骨鱼类螺旋瓣的研究

A study of the spiral valves of Chinese cartilaginous fishes

小肠可分为十二指肠和回肠，回肠具有18片几乎平行的螺旋瓣。

Small intestine can be divided to duodenum and ileum , and ileum has18 pieces of almost parallel spiral valves .

有研究指出，螺旋天线和圆锥喇叭相结合构成的螺旋-圆锥喇叭天线，可以有效地降低螺旋天线的副瓣电平，该天线在用作阵列天线的单元时，能够有效减小互耦。

The helicone which is composed of a helical antenna and a conical horn can reduce the sidelobe of the helical antenna . The mutual coupling between two helicones is less than that between two helical antennas when they used as units of an array antenna .