Sur=sure,表示“肯定”
surety n 保證;保證人(sure+ty)
assure v 保證;確信(as→再+sure→一再肯定→確信)
assurence n 保證(assure+ance)
reassure v 使確信,使放心(re再+assure確信→再次使人確信)
assuredly ad 無疑地
insure v 保險(xiǎn);保證(in進(jìn)入+sure→進(jìn)入肯定→不擔(dān)心→保險(xiǎn))
insurance n "n,保險(xiǎn)(in+sur+ance)"