The moon traces out a curtate cycloid curve in space .
月亮在太空中划出一道短摆线。
Spinoid scale a cycloid scale bearing a serrated margin ; superficially similar to ctenoid scales but having spines as outgrowths of the scale as oppose to true ctenii .
一种具锯齿边缘的圆鳞;表面上类似栉鳞,但其棘与鳞片自然长成的真实齿栉是相对的。
For this reason the cycloid is called the tautochrone .
由于这个缘故,摆线又叫做等时曲线。
Cycloid psychosis with symptoms of schizophrenia .