painstaking：需专注的，需细心的

pain,疼痛，-s,复数后缀，taking,承担。比喻用法。

• thorium
• thorn
• thorny
• thorough
• thoroughfare
• thorp
• those
• thou
• though
• thought
• thoughtcrime
• thoughtful
• thoughtless
• thousand
• thrall
• thrash
• thread
• threadbare
• threat
• threaten
• three
• threnody
• thresh
• threshold
• thrice