将不同温度对应的直线延长，它们在第一象限近似汇聚于一点。
We can see that the points of intersection corresponding to the different curves are not lapped well but dispersed.
首先找寻杓状的北斗七星，以杓柄上的两颗星的间隔延长五倍，就能在此直线上找到北极星。
Look for Big Dipper, spoon of form at first, lengthen fivefold with two interval of star, spoon of handle, can find the north star on this straight line.
尽管如此，治疗时间不可避免地延长了：当更换时放射外科治疗必须中止，配置各个准直器的直线加速器必须围绕患者运动。
However, treatment will inevitably take longer: radiosurgery is paused whilst the exchange is performed and the linac must be moved around the patient with each collimator fitted.
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