说明：掌上个人数字处理系统，实现通讯录、日历、计算器、电子画板功能。
Handheld personal digital processing system, realize the mail list, calendar, calculator, electronic drawing board function.
说明：掌上个人数字处理系统，实现通讯录、日历、计算器、电子画板功能。
Handheld personal digital processing system, realize the mail list, calendar, calculator, electronic drawing board function.
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