您要查找的是不是：
- portable meridian circle 轻便子午环
- A large reflect meridian circle is an instrument for the absolute determination of the declination and right ascension of a star. 大型反射子午环是用来绝对测定恒星赤经和赤纬的仪器。
- Keywords astrometry,meridian circle,CCD,control system,data processing; 天体测量;子午环;CCD;控制系统;数据处理;
- A meridian is an imaginary circle. 子午线是假想出来的一个圆圈。
- She only unbends in the family circle. 她只在家庭环境里才不拘束。
- Bob tuned in his portable radio to a record show. 鲍伯收听手提收音机的唱片广播。
- Completely portable and very light weight. 便携式的，而且重量很轻。
- Portable telephones are very popular nowadays. 现今，移动电话非常普及。
- The children formed a circle round her. 孩子们在她周围围成了一个圈。
- We've booked seats in the circle. 我们预订了楼厅包厢的座位。
- He found that little TV extremely portable. 他觉得那台小小的电视机携带极其方便。
- I bought my son a portable typewriter. 我给儿子买了一台手提式打字机。
- The document had been typed on a small portable. 这份文件是用便携式打字机打的。
- He has a large circle of friends. 他有一大群朋友。
- She moves in a very small circle. 她的活动圈子很小。
- The new portable computers are going like hot cakes. 新的便携式计算机卖得很快。
- the meridian circle 子午环
- He has a wide circle of acquaintances. 他交游甚广。
- A planar region bounded by a circle. 圆形区，圆形空间被圆所包围的一个平面区域
- She traded her roller-skates for Billy's portable radio. 她拿旱冰鞋换了比利的手提收音机。
