parts per million百万分之几

[=part per million]百万分之一
[=passive physiological movement]被动生理运动
[=permanent pacemaker]永久性起搏器
[=phosphopentomutase]戊磷酸变位酶,磷酸戊糖变位酶
[=posterior papillary muscle]后乳头肌
[=primidone]扑痫酮,去氧苯比妥
[=pulses per minute]脉搏数/分,每分钟脉搏次数