v. to draw back the lips and reveal the teeth, in a smile, grimace, or snarl
n. 露齿笑
v. 露齿而笑
1. She couldn't help but grin when she saw her birthday cake.
当她看到生日蛋糕时，她忍不住笑了。
2. He gave a big grin after winning the game.
他在赢得比赛后露出了灿烂的笑容。
3. The little boy grinned at his mother when she praised him.
小男孩在妈妈表扬他时对她露出了笑容。