cumulus humilis cloud

例句：

1. 1. Thecumulus humilis is a commontype of cloud in the sky.
   云朵是天空中常见的一种云。
2. 2. Thecumulus humilis was causing alot of confusion for the pilot.
   云朵给飞行员带来了很多困惑。
3. 3. Thecumulus humilis was visible from the groundas it moved across the sky.
   云朵从地面可见，当它移动过天空时。