When cut down and cut down on mean reduction, the differences in usage are: different meanings, different usages and different emphases.

Firstly, this usage has different meanings.

1. Cut means: reduce use; Cut down (trees)

2. Reduction means: reduction; Save; alleviate

Second, the usage is different.

1.cut down Usage: Extension can be expressed as cutting, digging, carving, intersecting, making (someone) feel pain or pain, being absent, and stopping. Pay attention to compound objects. If the object is long or contains interrogative words or relational words, it is often placed after adjectives as a complement.

2. Reduce usage: used as a transitive verb or an intransitive verb. When used as a transitive verb, it can follow a simple object or a double object. Its indirect object can be transformed into the object of the preposition for, and it can also be used as a compound object with adjectives as complements. When used as an intransitive verb, the subject is usually inanimate, and its active form often contains passive meaning.

Third, the focus of use is different.

1. Reduce the focus: focus on a wider range of uses.

2. Reduce attention: pay attention to abstraction when using.