英语翻译wherein said imaging section is responsive to detection

英语翻译
wherein said imaging section is responsive to detection by said sensing section of said physical movement for saving a sequence of images of the target and said reticle from a time interval which begins before detection of said physical movement,one of said images in said sequence being said image from said point in time.
said,童鞋们，这个是“上述的”。楼上两位朋友，麻烦再修订下。
童鞋们，虽然你们翻译了出来，看中文我还是看不懂！我连中文都看不懂！你们相互讨论下，