soulmate /ˈsəʊˌlmeɪt/ (also soul mate)

• 1. 

  N-COUNT A soulmate is someone with whom you share a close friendship and deep personal understanding. 知音

  例：

  Steve and I became soul mates, near-constant companions.

  我和史蒂夫成为了知音和形影不离的伙伴。