a.

1. 分不開的；不可分離的[（+from）]
   The two girls are inseparable friends.

   這兩個女孩是形影不離的朋友。

   Heat is inseparable from fire.

   熱和火是分不開的。

n.[P]

1. 不可分離的事物
2. 形影不離的朋友

adj.

1. unable to be separated or treated separately.
2. very friendly; close.