painstaking：需专注的，需细心的

pain,疼痛，-s,复数后缀，taking,承担。比喻用法。

• photocopy
• photoelectric
• photogenic
• photograph
• photographer
• photographic
• photography
• photojournalism
• photometer
• photomontage
• photon
• photophobia
• photorealism
• photoreceptor
• photosensitive
• Photoshop
• photostat
• photosynthesis
• photosynthesize
• phototropism
• phrasal
• phrase
• phraseology
• phreaking
• phreno-