Cumulus Form的用法和樣例：
例句
- In each one the exotic landscape or cloud form has been imaged as a kind of pointillistic nightmare.
其中每一副奇特的地表圖或雲層形態圖象都是一種用點描畫法繪製成的難看的怪物。 - Tornadoes form when winds blowing in different directions meet in the cloud and begin to turn in circles.Warm air rising from below causes the wind tube to reach toward the ground.
當雲層中不同方向的風相遇且開始環向旋轉時就形成龍捲風，低空熱氣流上升致使這種風管伸向地面。
