[kāi huā]
（花蕾开放； 比喻心里高兴或脸露笑容） flower; bloom; blossom; be in flower; come into flower
burst with joy; feel elated
心里乐开了花
The cherry-trees began to put forth their blossoms.
樱桃树开始开花了。
There is no blossom this year on the plum trees.
今年李子树不开花。
（裂开； 炸开） explode
The hand-grenade exploded right over the enemy.
手榴弹在敌人头上开花。