封闭线构成了表面的外缘。
时间地图是利用时间作为量算单位，根据城市外缘各点与城市中心的时间距离长短差异描绘出的等时线地图。
According to the difference of the temporal distance between the surroundings and the city centre, an isochronal temporal map can be drawn, where time is taken as a measuring unit.
线片及CT显示肿物位于骨旁，外缘不规则，可见放射状骨针影；
X -ray and CT scan showed that the tumors located at periosteum with irregular rim and visible radiated shadow of bone substance.
应用推荐