VOA慢速英语:‘The Immortal Life of Henrietta Lacks’ Tells a True Story About Science, Ethics and Family

1.It was not until the nineteen seventies that Henrietta Lacks' family learned that her cells had been taken and used by scientists.

It was not until that强调句型

not … until…结构在强调句型中的运用：until引导的时间状语从句，也可以用在强调句型中，但主要是其否定形式，如用在强调句型中，必须将not前移，写成It is/was not until … that … 。

       例如 It was not until the class began that he came in.

       It was not until last Friday that he finished reading the book.

2.The case of Henrietta Lacks brings up several moral issues.

bring up提及〔提出〕…

例句：Mr. Chairman, I should like to bring up the question of the reorganization of the committee.
      主席先生, 我想提出改组委员会的问题。

3.Rebecca Skloot tells this complex story by going back and forth between subjects and time periods.

back and forth来回地

例句：The wind moved the trees gently back and forth.
      风吹得树轻轻地来回摇晃。