Deviantbehaviour is one of the features of certain types of mental illness.
反常举动是某些精神疾病的特征之一。
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Without adequate data on the nature and extent of the problem it is difficult to formulate a policy to foster a culture of integrity that limits and discourages deviantbehaviour.
Therefore , school , family and related social institutions should take efficient measures to prevent teenagers' deviantbehaviour, and build a healthy social environment for them.