尼日利亚、伊朗、及利比亚表示他们可以不遵守该项协议，而伊拉克则表示不接受欧佩克对其生产水平的估计。 。
Nigeria, Iran and Libya have said they are exempt from an agreement, while Iraq has said it doesn't accept OPEC's estimates of its production levels.
传统信任模型直接把收集到的反馈进行运算，而不辨别反馈者的可信性，可能会导致信任估计错误。
At last, the conventional trust model calculated the collecting feedback directly without considering the creditability of their providers, which could lead to incorrect trust value.
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