"Hello friend" is the common Engpsh greeting to address someone as a friend. This phrase has been widely used in Engpsh-speaking countries and has become a staple in casual conversation.

Here are a few example sentences with translations:

"Hello friend, how are you today?" (你好朋友，今天怎么样？)
"Good morning friend, it's nice to see you." (早上好朋友，很高兴见到你。)
"Hi friend, have a good day." (嗨朋友，祝你今天过得好。)

Note: The use of "friend" as a term of address may vary depending on the culture and context of the conversation, and can range from formal to informal.