The root of ab comes from Latin, which can express negation or opposition. In common vocabulary, ab is generally combined with the root to form new words, such as abnormal, absolute, abort and so on.

In the medical field, ab is used for the root abdomin-, indicating the meaning related to abdomen, such as abdomen and abdominoplasty.

In addition, ab can also mean to be away from or separated from others, such as abduction, disorder, etc.

Abnormality is a word composed of the root ab and the affix -norm- (meaning standard or rule), which means abnormality and abnormality. Usually used to describe a thing that does not conform to general laws or standards, such as abnormal behavior.

In medical terminology, abnormality is usually used to describe pathological changes or abnormal states, such as abnormal blood pressure.

Absent is a combination of the root ab and the affix -stay- (meaning to stop or suppress), which means to quit and give up. It is usually used to describe behaviors such as quitting smoking and drinking, such as quitting smoking.

Politically, it definitely means not taking a stand or not voting. In some cases, abstention may also be regarded as a boycott, such as boycotting elections or boycotting some unfair behaviors.