VOA慢速英语:Study Finds Treatment Cured Sickle Cell in Adults

in all总共, 合计

例句：There are fifteen books on the first shelf, twenty-one on the second, that makes thirty-six in all.
       书架的第一层有15本书, 第二层有21本, 总共是36本。

2.The deformed cells block blood vessels and cut off the flow of oxygen to tissue in the body.

cut off切下,割下;切断,截断,隔离

例句：The slide cut off the valley from the rest of the world.
       山崩切断了这个山谷与外界的联系。

3.Their major organs are already too damaged to have all their bone marrow destroyed.

have sth. done

　　“have + sth. （宾语）+ 过去分词（宾语补足语）”意为“让/叫/使/请别人做某事”。宾语sth.后面用过去分词作宾语补足语，说明sth.与过去分词表示的动作之间是被动关系。例如：

　　We had the machine mended just now.

　　我们刚才请人把机器修好了。

　　He has had his hair cut.

　　他（请人给他）理发了。

　　The patient is going to have his temperature taken.

　　这个病人准备请/叫/让人量体温。

4.The study pointed out that many children die before they are even identified as having the disease.

point out指出,指明

例句：I pointed out the problems of the government.
      我指出政府的问题。