frontal triangle

例句：

1. 1.The car was parked in the front of the building.
   汽车停在大楼前面。
2. 2.The team is playing in the front row.
   队伍正在前排比赛。
3. 3. She stood in the front of the room and greeted everyone.
   她站在房间前面，向每个人打招呼。