[=person-year rad]个人年受照射拉德
[=pyramid]角锥形的,锥体
[=pyrazole]吡唑,邻二氮杂茂
[=pyridine]吡啶,氮(杂)苯
[=pyrimidine]嘧啶
[=pyruvate]丙酮酸盐