double flowering

例句：

1. 1. The plant doubles its flowers during the summer months.
   这种植物在夏季期间会开出双倍的花朵。
2. 2.Double flowering is a common feature of many tropical plants.
   双重开花是许多热带植物的常见特征。
3. 3.The double flowering of this species is unique and attracts many visitors.
   这种物种的双重开花是独一无二的，吸引了许多游客。