cascade rotary pump

例句：

1. 1. Thecascade of leaves creates a beautifulnatural landscape.
   树叶的连续落下创造了美丽的自然景观。
2. 2. The cascade of waterfrom the mountain falls down to the valleybelow.
   从山上流下来的水从山谷中倾泻而下。
3. 3. The cascadeof flowers in the park is stunning.
   公园里花的连续开放非常壮观。