a. High.
interj. An exclamation of joy, surprise, or encouragement.
interj. A cry to set dogs on.
interj. 嗨
1. Hey, how are you doing today?
嘿，你今天怎么样？
2. Hey, can you help me with my homework?
嘿，你能帮我做作业吗？
3. Hey, I just wanted to say thank you!
嘿，我只是想说谢谢你！