back traverse

基本解释

Pill-shaped microcameras already traverse the human digestive tract and send back thousands of images to pinpoint sources of illness.
药丸型的微型摄像机已经能够在人体的消化系统内工作，它传回大量的图片来帮助确诊病因。
They traverse back and forth searching and discovering, just like the obligatory 270? rotation that a fetus must perform before leaving the womb.
他们穿梭往来，各自寻找、发现，就像胎儿在出生之前必先要旋转270 度才可离开母体一様。
robert5354.blog.163.com
Functions are defined which let you traverse the resulting tree any way you like, access element and attribute values, insert and delete nodes, and convert the tree back into XML.
定义的函数允许随意遍历结果树，访问元素和属性值，插入和删除节点，以及将树转换回 XML。