The fireman filled our bucket with clean coal.

消防队员在我们的桶里装满了干净的煤。

Clean coal? What's that?

清洁煤炭？那是什么？

Others want nuclear, clean coal and natural gas.

一些则喜欢核能，清洁的煤炭和天然气。

These days, he is busy with three clean coal projects.

这些日子来，他为了三个清洁燃煤电厂项目而忙碌。

Quantitative assessing and screening on clean coal technologies suitable for resident.

民用清洁煤技术的定量评价与筛选。