out of sb’s depth

out of sb’s depth某人所不能理解;某人力所不能及：This book deals with theoretical mechanics，it is out of my depth.这本书是关于理论力学的，我不能理解。

• polypeptide chain
• cricket
• plug into
• have a shufti (at sth)
• acanthellas
• subsidiary to
• look out on
• exsertile
• uncages
• indicator tube
• rubber duck
• papiamentoes
• preanesthetic
• qanun
• kamagrapher
• make sb’s peace with
• look through sb
• arithmancies
• cordycepin
• con-
• settled
• gear teeth
• uncut
• egregious blunder
• one-to-one
• hold one's breath
• preferred position
• sport the（或one's）oak
• Salween, Salwin
• know not
• run into an ambush
• free from
• sportingly
• surinamers
• aminoacyl tRNA synthetases
• anes
• slider coupling
• sound a note of warning something
• put sb in mind of
• on beat
• steel-jacket
• molybdian
• synchronous machine
• sovietdom
• deployability
• allele frequencies
• piedmonts
• thalassian
• i.d
• vietnams
• knock one's head against a stone wall
• have a hot time
• the full monty
• menseless
• scissor jack
• heteroecious
• United States of Brazil
• euonymus
• DEMS
• mirky
• dubiously
• go from one extreme to the other
• idiosyncrasy credit
• Ungava Bay
• hybrid-T
• slinkingly
• inflations
• sperm whales
• abilitys
• command set
• deindividualize
• Rosales
• san juan mountainss
• GPS
• prev
• dirty-minded
• griming
• ulterior
• fork oscillator
• cooling method
• shoot out one's lip
• shard
• put to flight
• wind rose
• cowgirl
• club cars
• bring into force
• self-slaughtered
• Falklands effect
• resentingly
• mule
• papist
• cavated
• me generation
• progressive bonding
• plow a (或 one's)lonely furrow
• by-bidding
• aerological day
• southbound
• week of Sundays