plant introduction

pitch circle: the pitch cycle is the imaginary circle on which most gear calculations are based.

间距循环：间距周期是虚圆齿轮的大部分计算为基础。

The equator is imaginary circle around the earth.

赤道是人们在地球上虚构出来的图象.

A meridian is an imaginary circle.

子午线是假想出来的一个圆圈。

The equator is an imaginary circle around the earth.

赤道即假想的环绕地球的大圆.

influence of imaginary circle diameter on gas-flow rotation characteristics near six corners burner region

假想圆对六角燃烧器区域气流旋转特性的影响

Rotate each ankle in a complete circle . Draw imaginary circles with the big toe five times.

全方位旋转脚踝, 想象用大拇指画圈五次.

the track of the revolution of the earth is called ecliptic, and the imaginary circle vertical to the earth's axis is called equator.

地球围绕太阳运行的轨道叫“黄道”，在地球中央有一条假想的与地轴垂直的大圆圈，这就是赤道。