句中的da应该为do吧?另需要根据上下文意思或语境来判断key的具体指意.key 原义为钥匙,引申为某事的关键、核心所在等（以下译意用“它”来指代）
句子意思理解上有几种：
它对你来说确实有用.
对你来说它确实会在某些事上起到关键作用.
它确实是你用来处理某事的关键所在.
the key really has something to da with
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