名詞 ir:

1. a heavy brittle metallic element of the platinum group; used in alloys; occurs in natural alloys with platinum or osmium
   同義詞：iridium, atomic number 77
2. a board of the British government that administers and collects major direct taxes
   同義詞：Inland Revenue

Ir
NONE（無詞性）
The symbol for the element iridium
元素iridium的符號