You hold a portfolio of long call options on Apple, and you are delta-hedged. If Apple's stock price drops by $5, what happens to the delta of your options, and what specific action must you take to maintain a delta-neutral position?

你持有一个做多苹果看涨期权的投资组合，并且已经做了Delta中性对冲。如果苹果股价下跌5美元，你期权的Delta会怎么变？你需要具体做什么交易来维持Delta中性？