a moving target

a moving target something that is changing continuously, so that it is very difficult to criticize it or compete against it活动的靶子〔指某事物由于不断变化而让人无从批评或难以竞争〕:•The company is constantly improving the system, making it a moving target.公司不断改进这一系统，让竞争者难以企及。

• avalanche transistor
• componentries
• man（或woman）of the world
• the inside lane
• microfilmable
• Diet Cokes
• costumer
• wild ducks
• biosensor
• retain
• retardative
• sea mosses
• snow-clad / ivy-clad etc
• empowerment
• show girl
• languid
• defilest
• riskers
• my
• pistillate plant
• fatidic
• receptorology
• obligate
• damp someone's ardour
• armenian churches
• underminings
• right-justified
• sudanese pounds
• shoot one's grandmother
• bout
• sea leopards
• hold a dread of
• make a bolt
• differential wound field
• wedeln
• vainglorious
• twistor
• exrx
• cherry pick
• correlation distances
• Hoyle, Edmond
• superciliary ridge
• pierced
• come out in sth
• defecate
• lay to
• Knight of Malta
• Buonarroti, Michelangelo
• phonoes
• recordable
• steatornithidaes
• telautogram
• seed money
• jet spinning
• nrem sleeps
• B.Mus.Ed.
• de-anglicized
• phenograms
• satisfaction note
• antenna effect
• in the heart of
• executive agreement
• filling
• all-out war
• emblas
• goboon
• sprechgesang
• became
• settle on/upon sb/sth
• monumentalism
• photo-essays
• Houben-Hoesch synthesis
• Free World
• shelter tents
• seamounts
• ethionines
• no better than
• warmongerer
• lose one’s belief in
• PICC
• snippetiness
• tidal hypothesis
• tonoscope
• sensitisations
• for the good of
• cannonades
• amusive
• fall into disuse
• refuters
• touch ... up
• take notes
• adscititious
• promptbook
• gymn-
• nation-states
• humourlessness
• dithiocarbamic acid
• sweeping score
• doughy
• pyrogen