Therefore, you often need multiple scans to be able to identify all the hosts on the network that you know are valid.

因此，您通常需要进行多次扫描，以识别网络中所有有效的主机。

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After it takes multiple scans, you can align and merge them into a single model.

FORBES: 3D Scanner from NextEngine Makes it Possible to Capture an Object

Mr. Page, a maintenance technician who lives in Clearfield, Utah, learned that his cumulative exposure from multiple scans he received at Intermountain was 97.3 mSv.

WSJ: New Tracking of a Patient's Radiation Exposure

But it isn't clear whether the risk is the same from cumulative exposure in smaller doses, such as multiple CT scans each delivering 10 mSvs.

WSJ: New Tracking of a Patient's Radiation Exposure