a beam of delight

• 笑逐颜开

a beam of delight的用法和样例：

例句

1. Mrs. Zhang couldn't restrain a smile of joy.
   张太太不由得笑逐颜开。
2. The delight on the faces of the representatives of the winner, Rio de Janeiro, equalled any beaming gold medal winner.
   最后赢家里约热内卢代表团团员的兴奋溢于言表，宛若金牌得主一样笑逐颜开。