Place it at the end of a chat exchange, after the back-and-forth about time and place, so it closes the scene. Pair it first with the WhatsApp message sound, then follow with a look at the message cue for a reply chain built from a real conversation.
关于此声音
This is a short spoken French phrase confirming that a meeting is set, delivered in a clear, matter-of-fact voice. It sounds like a quick reply sent to lock in a plan, with no fuss and no extra explanation. The tone feels calm and reassuring, the kind of confirmation that settles a chat and lets everyone stop asking when and where.