circularlyadv.圆地；圆形地；循环地circularadj.圆形的；循环的n.传单；通报circular column圆柱circular pulley圆滑车circular burner圆形喷灯circular cavity圆形空腔谐振器circular flange圆法兰盘circular vector环量circular comber圆梳机circular degree圆度circular blanks圆形毛坯circular points虚圆点

1. Shaped like a cone extending into space, the umbra has a circular cross section that can be most easily seen during a lunar eclipse.
   本影就像一个圆锥一样延伸在空间中，当月食发生时，它很容易被看到。