be on the alert

be on the alert警觉;注意：Explorers marched in a primeval forest，they were on the alert that there might be ferocious will beasts around.探险家们在一个原始森林中行进，他们提高警觉，提防周围有猛兽出现。

• buried in in one's own thoughts
• NHRA
• stress relief annealing
• laminated paper
• show window
• novolac resin
• jamaica rums
• break ship
• Judaea
• take no heed
• cerebriform
• pieplants
• parallel axiom
• Wiseman, Nicholas P.S.
• strangeness number
• fiber
• aktology
• reservations
• campaign button
• las crucess
• glassified
• Shope papilloma
• areciboes
• Kelvins
• sporogenous
• arty.
• loathsomeness
• strait gate
• death fantasy
• lobbyisms
• flattopped
• eleemosynary
• Peloponnesus,Pelopennesos
• quarter days
• brussels carpets
• faradise
• breakdancing
• incisor
• organicity
• slam the door in sb's face
• incogitant
• aloneness
• tree-dozer
• believe it or not
• pale-
• Hess, Victor Francis
• unpopularly
• addition reactions
• euroissues
• reable
• phthalic anhydride
• malnutritions
• linen scroll
• carbon electrode
• trenchantly
• like father like son
• inductive charging
• Sinologist
• make talk
• rashest
• Machida
• dash against
• count against sb
• procreation
• salutatorians
• differential analysis
• owl trains
• toss one's hat in the ring
• gravaminas
• Lytton, Edward Robert Bulwer Lytton,lst Earl Lytton
• balance of production and marketing
• jilt
• adrenitis
• toxaphenes
• augustnesses
• Burroughs,William Seward
• fribbles
• put ... down
• singularized
• photological
• if worse comes to worst
• -nomy
• referent
• punch sth↔out
• Paolo
• electromotive series
• born to
• colorslide
• feminised
• rock stream
• lung bud
• bharal
• Chirocentridae
• Tver
• retreatest
• pretty as a as paint
• description
• sulphapyrazine
• cropped pants
• take to something like a duck to water