千不该，万不该qiān bù gāi , wàn bù gāi

deeply(/a thousand times) regret; should never have done sth
❍ 只是昨日～，铰了那玉上的穗子。(《红楼梦》356) I should never have cut that tassel off his jade.

• resurface
• resurge
• resurrect
• resurrection
• resurrection plant
• resuscitate
• retable
• retail
• retain
• retake
• retaliate
• retard
• retch
• retell
• retention
• retention，memory
• retest
• rethink
• retiary
• reticent
• reticle
• reticuloendothelial system
• retina
• retinal detachment
• retinue