as rare（或 scarce）as hen's teeth

as rare（或 scarce）as hen's teeth extremely rare 罕见的, 稀有的。

• lard-bucket
• bemean
• gaillardias
• drapings
• Yenbo
• offshore bar
• sulphurators
• mallee fowls
• electromagnetic coupling
• colluders
• burins
• give place to sb/sth
• paradoctors
• marginal blight
• dynamic geomorphology
• underbunching
• on the other side of the fence
• crush down
• subsistences
• spirillum
• metropolis nations
• as you think proper
• neologically
• msrs
• phycologists
• clotbuster
• fluid ounce
• broodies
• pyknic
• compurgatory
• middle Cs
• a fury of sth
• stand on one’s defence
• godspeeds
• alkanes
• shea nut
• in (the) block
• galvanise
• delta pulse-code modulation
• circulating storage
• basic indexed sequential access method
• Bubba ticket
• syllogizers
• juxtaglomerular
• Supermalloy
• mag-lev
• mnemon
• ideals
• churlishly
• dolldom
• signature tunes
• talent money
• peg model
• play chicken
• resolve into sth
• covellite
• solar paddles
• clean sb out
• nine to five
• machinable
• kerfed
• picturable
• height above landing
• fracture English
• ragpicker
• Menotti, Gian Carlo
• SAB
• atilt
• enlightens
• secondary inductance
• softwood
• frontlash
• whaleboat
• bijections
• Lophogastrida
• teensy
• lightless
• ryer
• whisk into
• glycuresis
• four-in-hand tie
• principal
• trihydroxy
• mellotrons
• ill-uses
• sciomachies
• debate with
• fenchyl alcohol
• as red as a lobster
• white supremacies
• oilpapers
• fast nova
• imperium
• divergences
• salals
• Pasadena
• top-dog
• whinstone
• throw down the glove/gauntlet
• go to press