Howard's Four Classes of Clouds:
Cirrus, Stratus, Cumulus, Cumulonimbus
The Ten Basic Types of Clouds in Weather:
High Clouds - Cirrus, Cirrostratus, Cirrocumulus
Middle Clouds - Altostratus, Altocumulus, Nimbostratus
Low Clouds - Cumulus, Stratus, Cumulonimbus, Stratocumulus
+Jeston Lu , am I correct? 
You can totally be a meteorologist in the future...

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