communicative

Although he is shy, he becomes very communicative when talking about history.

(Chinese) 虽然他很害羞，但在谈论历史时，他会变得非常健谈。

Successful teachers must be highly communicative to explain complex ideas clearly.

(Chinese) 成功的教师必须具备很强的沟通能力，才能清晰地解释复杂的想法。