一个表中有太多列比仅有一些列时进行查询所需的扫描时间要长。
Too many columns in a table can make the scan time for queries much longer than if there are just a few columns.
典型的岩石核有几米长，因此首先要采用标准医学扫描仪对其进行粗略的CT扫描。
A typical core is several metres long, so it is first subject to a rough and ready ct scan using a standard medical scanner.
300米长没有任何中心支撑的透明屋顶，能显示结合PET扫描活体功能信息与CT扫描解剖图像整体的仪器，受冲击时自行销毁以免伤人的汽车保险杠，等等。
A transparent roof spanning 300 meters without any central supports. A device to display integrated anatomical information from a ct scan with live functional information from a PET scan.
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