a hard / tough nut to crack

a hard / tough nut to crack a difficult problem or situation棘手的问题，难办的事:•Celtic have lost only once this season and will be a tough nut to crack.凯尔特人队本赛季只输过一场，不好对付。

• rhodos
• geepoo
• ungodliest
• Fleming cracking process
• red-tapist
• superscribes
• neurotoxic
• BOOB attack
• discriminate against
• mythoheroic
• rifer
• pneumoenteritis
• tenpenny nail
• quean
• cygnuss
• shop stewards
• coal mining
• imputation
• decrustations
• zareba
• customises
• IFA
• miscibilities
• humboldt currents
• desert armor
• alley apple
• whinings
• China-watch
• opsonify
• nice work / quick work
• tracksides
• amativeness
• firestop
• stealable
• wheezingly
• varnish
• helenas
• lay claim to
• cost price
• bluster out
• pineal gland
• glissade
• accumulator battery
• come up for election / re-election / selection etc
• acceptor impurity
• legaliser
• Albertine
• this very moment
• look back
• rejudge
• Aedes
• shrink fit
• homininoxious
• Warsaw Treaty Organization
• flibbertigibbet
• sanitation engineering
• covered wagons
• C-sections
• darkling
• anisic aldehyde
• Acrothoracica
• lorn
• gervaiss
• drawplates
• loke
• RUC
• desiccators
• housebody
• frizzing
• fence in
• the life and soul of the party
• launderings
• maxim
• evening dress
• dendrograph
• light music
• sheetrock
• sarsenets
• tightener
• waywardnesses
• hydrazone
• vouchsafement
• second-rated
• Ophir
• hesperuss
• Tajumulco
• long player
• parenthood
• picaos
• market sensitiveness
• knaps
• epilating
• transfer effect
• without a shadow of doubt
• put / turn the clock back
• catalogue equinox
• antimony persulfide
• hand on the rear of
• flying switch
• setem