Pa.

Pa is busy on the telephone.

爸爸正忙着打话。

Pain with motion is the predominant finding， and crepitation may be palpated with pa ive motion.

最突出的表现是活动时疼痛，被动活动可触到磨擦感。

Abstract: Pyrrolizidine alkaloids(PAs) are widely distributed in plantae.Many PAs are hepatotoxic,Lung toxicity(carcinogenesis),neurotoxic and cytotoxic.

摘 要： 吡咯西啶生碱广泛分布界。

To establish the animal model of re pa rative dentinogenesis and investigate the histo-morphological feature of reparat ive dentinogenesis.

建立修复性牙本质形成的动实验模型，观察修复性牙本质形成的组织形态学特征。