问题描述：
diamonds are very impressive as they are mined钻石刚开采时并不光彩照人.
diamonds are very impressive as they are mined钻石刚开采时并不光彩照人.
英语有语法错误吗?as可以改成at吗?
diamonds are very impressive as they are mined钻石刚开采时并不光彩照人.
英语有语法错误吗?as可以改成at吗?
问题解答：
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