64．A detailed study has been made of the prints using photogrammetry，a technique for obtainingmeasurements through photographs，which created a drawing showing all the curves and contours of theprints．

(被动语态)

已经使用照相测量法(一种通过照相获得测量数据的技术)对这些脚印进行了一项详细的研究，这种方法产生了一张显示脚印所有曲线和轮廓的照片。

分句1. Adetailed study has been made of the prints using photogrammetry

分句2. atechnique for obtaining measurements through photographs

分句3. whichcreated a drawing showing all the curves and contours of the prints

2和3并列

1和2，3嵌套