BMW W styling has distinct characteristics, shaped garden lamps with a rectangular tank ventilation gateframe to form a distinctive style.
宝马轿车车身造型具有鲜明的特色，园形灯具配以矩形水箱通风栅架形成与众不同的风格。
2
The exit gate is known, because it's a return message that is connected from a lifeline to the diagram's frame with the arrowhead connected to the frame.
出口门同理可知，因为它是一个返回消息，连接从一个生命线到图的框架，箭头连接框架。
3
To add a Formal Gate on the interaction frame, click a message palette creation tool.