You're right. I'm no nuclear expert

你很对我不是核专家
but Dr. Houston Wood at the university of

但弗吉尼亚大学原子研究所的
Virginia Atomic Facility is.

休斯敦·伍德教授他是专家
He also knows Dr. Zippe

他也认识齐佩教授
and he told him that the wall thickness of the Iraqi tubes

他告诉他伊拉克的铝管壁厚度
was 3 or 4 times the thickness of his design.

是他设计的三或四倍
Right, and he also said that

他还说了
the length of the tubes is twice that of Zippe's design.

这些铝管长度也是齐佩设计的两倍
In fact, he said that the only thing that was similar

事实上他说他设计的管子和那些铝管
between his tubes and the aluminum tubes

唯一的相似之处是
was that they were both made of aluminum.

它们都是铝制的
A metal that hasn't been used in gas centrifuges since 1952.

1952年开始气体离心机内就已不用金属了