HackerLecture 1 | Programming Paradigms (Stanford)
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两台 ATM 可能各自读到足够的余额。共享账户的要求是检查与扣款作为整体完成，仅仅让两台机器各自都正确比较数字仍会出错。
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That $100 account balance is the shared resource that two different processes have access to.the account balance check and the withdrawal are basically done not at all or in full