定义
a cloud: 白云
to have one's head in the clouds想入非非
cloudy: 乌云密布，不清晰的
- "And those clouds look like marshmallows."
- "The clouds are white and fairly fluffy."
- "I spend my days in a cloudy laboratory..."
- "I spend my days in a cloudy laboratory-"
- "Let's start with the basics: the sky is blue and there are a few clouds in it."
