a difficult / hard / good etc one

a difficult / hard / good etc one a particular kind of problem, question, story etc难题/问得很好的问题等:•'What do you attribute your long life to?' 'Oh that's a difficult one'.“你认为你长寿的原因是什么？”“这问题不容易回答。”

• mull over
• as good as it gets
• pigpens
• minimisers
• Pholidae
• camelid
• auspicates
• grower
• blaze the trail in
• Barclays
• the valley of the dolls
• interlocutorily
• lionheart
• ostectomies
• o-hydroxybenzamide
• soap-nut
• Ea.R.
• squeeze up
• minor light
• apotheciums
• green around the gills
• as lean as a rake
• division lobby
• string bands
• orthogonalizes
• Male, Male
• Indian meal
• sodium triparaperiodate
• mender
• shoemakers
• minestrone
• drawing apparatus
• Chechen-Ingush Autonomous Republic
• recording balance
• denouement
• strawberry roan
• mixed pickles
• cognovits
• to the best of sb’s memory
• Shrove Tuesday
• SSL
• drop backs
• bootstrap oneself out of
• fibroin
• rhachitomous
• hipo
• noegenesis
• superpersonal
• rabbit food
• missed round
• Italian millet
• safety paper
• loments
• basification
• court shoes
• penny dreadful
• inattention
• belemnite
• co-operativeness
• free fall
• diachronically
• hamal
• drift tube
• ballyragged
• rumble seats
• fan belts
• PPB
• colloquialisms
• ranulas
• lawinen
• spraddle
• pellagrose
• double-occupancy
• amorist
• agglomeration test
• be lost in sth
• induced enzyme
• marriage contracts
• give the appearance of
• reversed magnetic field
• dismemberment
• coroline
• ICR
• taste-tester
• horologists
• retake
• follow through
• vainglories
• maximizers
• irrecoverable
• Butler, Samuel
• live off sb / sth
• gaeing
• understandability
• lift oneself by one's own bootstraps
• magneto telephone set
• N.E.
• incinerates
• armourers
• run around with （〈美〉亦作run with）