painstaking：需专注的，需细心的

pain,疼痛，-s,复数后缀，taking,承担。比喻用法。

• wastrel
• watch
• watchword
• water
• waterboarding
• water chestnut
• watercress
• watered silk
• waterfall
• waterlogged
• waterloo
• Waterloo
• watermelon
• waterproof
• watershed
• waterspout
• water strider
• watertight
• Watford
• Watt
• watt
• wattle
• wave
• wavelet
• waver