It was less than two years after the principle of solid circulation was confirmed in the large-scale pilot plant.

这距固体循环的原理在大型中间试验装置中得到确认之后不到两年。

youdao

It was less than two years after the principle of solid circulation was confirmed in the large-scale pilot plant.

这距固体循环的原理在大型中间试验装置中得到确认之后不到两年。

youdao