PHn.[化]酸碱度(=Potential Of Hydrogen)abbr.公共卫生(=Public Health)abbr.紫心勋章(=Purple Heart)phthalinn.[化]二R甲基苯酸；酞灵

1. Injury to the phrenic nerves should be avoided.
   应注意避免损伤膈神经。
2. However, tumors originating from the intrathoracic phrenic nerve are rare.
   而肿瘤起源于胸内膈神经是罕见的。