cascade hydropower development

例句：

1. 1. The cascadeof leaves is a beautiful sight in autumn.
   秋天，树叶的层层叠叠是一道美丽的风景。
2. 2. The cascade ofwater from the mountain falls down to thevalley below.
   从山上流下来的水从山谷中倾泻而下。
3. 3. Thecascade of flowersat the botanical gardenwas breathtaking.
   植物园里那片花海令人叹为观止。