He has been graded down because of his physical condition.

他因为健康不佳而留了级.

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His marks are so poor that he will have to be graded down.

他的分数这么低,肯定会被降级的.

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The road is no longer fit for heavy traffic, and will be finally graded down.

这条公路不适应繁忙的交通, 最终会被降低级别.

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