1 sentence for 界 (jiè — kingdom)

1. 喷火是在动物界未知的，但在理论上是可能的。

   pēn huǒ shì zài dòng​wù​jiè wèi​zhī de, dàn zài lǐ​lùn​shang shì kě​néng de.

   Fire-breathing is unknown in the animal kingdom, but is theoretically possible.

   Source: CCMatrix