One suggestion often proferred is that the melanin in black

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/11/05 20:49:55

One suggestion often proferred is that the melanin in black skin,by absorbing ultraviolet light which might otherwise damage DNA and cause mutations,protects against skin cancer.Certainly,white-skinned people who move to the tropics are more at risk of such cancers than they would have been had they stayed at home.But critics of this hypothesis point out that most types of skin cancer,specifically the basal-cell and squamous-cell carcinomas that are the commonest varieties of the disease,tend to affect older people (who have already reproduced and are thus,in Darwinian terms,expendable) and are often not lethal anyway.这句话中profer是什么意思?还有 critics of this hypothesis 这个该怎么翻译比较好.最后一句括号里的怎么翻译啊

这位网友,没有查到‘profer"这个单词,与之最接近的是 proffer :v.提供；提出
One suggestion oftern proffered ：意思是“一个经常被提出来的建议”
第4行 critic:名词,批评者； critics of this hypothesis 是指这一假设的批评者,即对该假设持不支持/反对意见的人们
最后部分括号里是一个定语从句,修饰前面的older people,该从句意思是说：这些上了年纪的人已经生养过了,因此用达尔文学说的术语来说,这些老年人就是“expendable”的.
希望以上解释对这位网友解开疑问有所帮助.欢迎追问.

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