it is difficult to be sure about radiation damage-a person may feel perfectly well
It is difficult to be sure about radiation damage — a person may feel perfectly well.
破折号给你提示,后面的句子是对前面句子的补充说明。为什么说很难肯定是否得了放射病,因为受了辐射伤害的人可能感觉良好。
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