Definition
An expression used to grant someone permission to do something or use something; indicating that they are welcome to proceed.
請便
"May I borrow your pen for a moment?" "Be my guest!"
「我可以借你的筆用一下嗎？」「請便！」
"Is it okay if I use your computer?" "Of course, be my guest!"
「我可以用你的電腦嗎？」「當然，請便！」
"Can I use this meeting room for a bit?" "Be my guest, it's not in use right now."
「我可以借用一下這間會議室嗎？」「請便，現在沒人用。」