1. Porokeratosis (PK) is a clonal disorder of keratinization that is histologically characterized by the presence of a cornoid lamella.
   摘要PK是一群角化异常的疾病，病理下的特徵是可见所谓的角样板。
2. This paper has studied the technological process for preparation of grain potassium picrate (PK), which can meet the requirements of production in batches.
   研究了粒状苦味酸钾的合成方法和工艺条件,此工艺已扩大到几百克量级,可满足于火工药剂的批量生产。
3. Later period is OKer, attack goes up still is very powerful, PK, carbon, upgrade, it is brunt artillerist, also be main punching bag of course.
   后期就比较可以了，攻击一上去还是非常强大的，PK、副本、升级，都是主力炮手，当然也是主要攻击目标。

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