There is a minimum size for the reactor at which the chain reaction will just work.

为使链式反应刚好能够维持下去，反应堆要有一个最起码的尺寸。（目的状语）

youdao

There is a minimum size for the reactor at which the chain reaction will just work.

为使链式反应刚好能够维持下去，反应堆要有一个最起码的尺寸。（目的状语）

youdao