problematic：有疑问的，未解决的，未定的 

词根词缀：pro-前 +blem扔,抛 + -atic形容词词尾

• phreaking
• phreno-
• phrenology
• phwoah
• phylactery
• phyllo-
• phyllophagous
• phylum
• physic
• physical
• physical education
• physicality
• physically
• physician
• physicist
• physics
• physio-
• physiognomy
• physiological
• physiologist
• physiology
• physiotherapy
• physique
• pi
• pianissimo