cascade tax

例句：

1. 1.
   瀑布
2. 2.
   水、雪等
3. 3.
   瀑布
4. 1. The waterfall is cascading down the mountainside.
   瀑布正从山腰倾泻而下。
5. 2. The snow was cascading down the slopes.
   雪正从山坡上不断滑落。
6. 3. The river cascading through the valley was a sight to behold.
   蜿蜒穿过山谷的河流是一道壮观的景象。