摘要： Radioactive matter is dangerous to work with because it has a bad effect on the blood. 从事放射性物质工作是危险的.因为它对血液有不良影响. have effect on是“对--有效. “对--产生影响 的意思.effect可以被any/great/much/no /some/ little等词所修饰. Punishment does not have much effect on the boy. 惩罚对这个孩子没起太大的作 用. Did the medicine have any effect on you? 这药对你有效吗?

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