promise在这句话里作动词用吗

Question

But the rolling backpack seems to have solved the weight problem , and the astounding costs to outfit every student with an e-reader ,provide technical support and pay for regular software updates promise to make the e-textbook a very pricey option
promise如何翻译 如果作动词 那前面不是还有pay for吗

Answer 1

定期更新软件并支付费用将使电子教科书成为一个非常昂贵的选择承诺。
promise
美 [ˈprɑməs] 英 [ˈprɒmɪs]
vi. 有前途;有指望;许诺
vt. 给人以…的指望或希望;许诺;允诺
n. 许诺;希望;诺言;指望

Answer 2

名词，许可，软件更新许可