通常向前扫描字符串比反向扫描更安全。
It is usually safer to scan a string forward rather than in reverse.
目的探讨腰椎峡部CT反向扫描技术的价值。
Objective To discuss the value of CT Opposite Scanning Technique in Lumbar Isthmus diagnosis.
于是他反向推算了一下扫描仪生成符合机场安检要求的图像所需的X射线剂量。
He calculated backward to figure out how big an X-ray dose would be needed to get the kind of images the machines produce.
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