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ThethinboyglancedswiftlybackandforthbetweenJacobandme,whilethebrawnyboykepthiseyesonme,aslowsmilespreadingacrosshisface.forth要怎么理解!

题目详情
The thin boy glanced swiftly back and forth between Jacob
and me,while the brawny boy kept his eyes on me,a slow smile spreading across his face.
forth要怎么理解!
▼优质解答
答案和解析
back and forth 一起理解,算词组
就是说瘦男孩 看我一下又看JACOB一下 换来换去