They are in Gongmen jail, at Black Dragon area.

他们被关在宫门城牢房，在黑龙区。

Sure enough black dragon mountain has one left.

果不其然黑龙山上已然一个人都不剩了。

The dwarf pushed his black dragon across a range of mountains.

侏儒将他的龙推过山巅。

This precious pearl was grown on the chin of the black dragon.

这颗价值千金的明珠是长在黑龙下巴底下的，你摘它的时候黑龙必定是睡着了。

You happened to get it because the black dragon dropped asleep.

你无意中得到它，必定是黑龙睡着了。