"All right. Here I go." I took off running, my sneakers
splashing rainwater from puddles, the hand clutching the kite end of the string
held high above my head. It had been so long, so many years since I'd done
this, and I wondered if I'd made a spectacle of myself. I let the spool roll in
my left hand as I can, felt the string cut my right hand again as it fed through. The kite was lifting
behind my shoulder now, lifting, wheeling, and I run harder. The spool spun
faster and the glass string tore another gash in my right palm.
（出自《追风筝的人》）
请问老师这一段落中的 fed through 是什么意思？我参照了海峡两岸两种翻译版本，但是这两个版本都没有明确译出这个词语，英汉词典上也查不到。
