Some 40 kilograms of uranium compounds were taken which were being used for scientific research.

用于科研的大约40千克铀化合物被夺取。

Today, enrichment is often done by passing a gaseous uranium compound through centrifuges to separate lighter U-235 from heavier U-238.

现今，浓缩通常是由气态铀化合物通过离心机从较重的 铀-238 分出 较轻的 铀-235来实现。