准备买正价的 openapi pro 5x， apple 美国店 准备 100 刀的礼品卡 够不够？ 或者 120 刀？
我记得网友说，必须先买 plus 再升级刀 pro5x 。所以 100 刀够不够？ 举例：订阅完 20 刀的 plus 后，只剩 80 刀， 是不是不够买 pro 5x 了？ 难道要准备 120 刀？
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