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1. 自动的;自动化的
An automatic machine or device is one which has controls that enable it to perform a task without needing to be constantly operated by a person. Automatic methods and processes involve the use of such machines.

2. 自动枪
An automatic is a gun that keeps firing shots until you stop pulling the trigger.

3. 自动挡汽车;自动变速汽车
An automatic is a car in which the gears change automatically as the car's speed increases or decreases.

4. 无意识的；不假思索的
An automatic action is one that you do without thinking about it.

1. a pistol that will keep firing until the ammunition is gone or the trigger is released

Synonym: automatic pistol

2. light machine gun

Synonym: automatic riflemachine rifle