be an effort

be an effort to be difficult or painful to do费力，痛苦:•I was so weak that even standing up was an effort.我太虚弱了，连站起来都很费力。

• from the fact that
• New Realism
• spacelifter
• low-lying
• reconsolidations
• black scours
• ghostfish
• congeneric
• Steinitz, William
• brasses
• monegasques
• stand to one's lick lick-log
• anthropocentricities
• bushranger
• ordinal
• sciaras
• CEGB
• tractored
• supermultiplets
• break bulk
• good-night
• contentednesses
• housewifed
• Arbela
• accelerating agent
• peremptoriness
• losts
• quant
• pseudovirion
• synchronous detector
• sensationalizing
• pick sth ↔ up
• virtuals
• vigesimo
• gearksutite
• bird-footed dinosaurs
• radiobiologic
• formal grammar
• Jack Mormons
• apyrexia
• eruct
• measure space
• a turn of speed
• utopistic
• essential to
• programmed design
• blitheful
• comatose
• melancholic
• Cym
• full binding
• alumslate
• plane of incidence
• acrodynia
• natural key
• housewiferies
• badasses
• lienal
• expiring
• have mercy on someone
• effective capacitance
• cleanlied
• Bonnevie-UIIrich syndrome
• leviratic
• multivallate
• Piaf, Edith
• Andvari, Andvare, Andvar
• lay on one's oars
• Eutychianus
• watchless
• open coast
• cut sth↔out
• bring in
• Sydenham's chorea
• basilar plate
• laparogastrotomy
• put someone straight
• pencil cedar
• befit
• compound motor
• draftings
• open-cycle engine
• on form
• phlyctenule
• Madame Racamier-type couch
• abductees
• spotted crakes
• NFS
• play (sth) by ear
• proguanil hydrochloride
• thought lessly
• trotty
• pinnula
• Hydraulic Presses
• sail before/with the wind
• fractionize
• catabolite repression
• Victoria Nyanza
• fox trot
• face book