painstaking：需专注的，需细心的

pain,疼痛，-s,复数后缀，taking,承担。比喻用法。

• adventure
• adventurer
• adventurous
• adverb
• adversary
• adverse
• adversity
• advertise
• advertisement
• advice
• advisable
• advise
• advisory
• advocacy
• advocate
• advocate
• advocator
• adynamia
• adze
• adzuki
• Aegean
• aegis
• aeolian
• aeon
• aerate