The original plan was to encase a small amount of a radioactive substance in a protective steel container.

原先计划是要将少量的放射性物质封存在一个钢质防护罩中。

youdao

The original plan was to encase a small amount of a radioactive substance in a protective steel container.

原先计划是要将少量的放射性物质封存在一个钢质防护罩中。

youdao