be essential for/to

be essential for/to是……所必要的;最重要的：Exercise，fresh air and good sleep are essential for preservation of good health. 运动、新鲜空气和良好的睡眠是保持健康良好所必要的。

• ask for it
• con moto
• adiabatic invariant
• cloudiest
• people / women / students etc of color
• buyers' strike
• have reason for
• conceptual art
• a day or two
• acierates
• coastal dune
• in satisfaction of
• weak moment
• benzene rings
• tear/rip the heart out of sth
• chromospheric network
• catcallers
• bovver boys
• swim between two waters
• churchmanlike
• give sb a boost (up)
• big rag
• come to blows (over sth)
• ambient noise
• check up with
• acrodermatosis
• a weakness for sth
• amphid
• broomrape
• attend on/upon
• bearded
• chain stitcher
• bedeswomen
• put sth under the microscope
• go/run to waste
• sb's too good for sb
• comminuted
• bipolar signal
• carpet beetles
• comparable worth
• do 10 miles / 20 kms etc
• best girls
• board the gravy boat
• coigne
• card-carryings
• crown imperials
• by agreement
• alongshore
• caracals
• back swimmer
• muscle in
• cosmologist
• a.l.
• set apart
• by chance
• ASAS
• cellular affinity
• bowheads
• long live sb / sth
• do someone dirt
• canonistical
• coifed或coiffed
• Colombian
• arachnoid membranes
• sport-utility vehicle
• brat pack
• barrowing
• continental quilts
• nerve / muscle fibres
• aspergillus
• cosmetic surgery
• lock sb/yourself in (…)
• believe one's ears
• chargepayer
• commend itself to
• aegyptopithecuss
• bind someone over
• bioelectrochemistry
• nothing of the sort / kind
• acuminate
• cap gun
• send sth on
• break against (on)
• Butterworth filter
• charge neutrality
• snow-bound / strike-bound / tradition-bound etc
• belgrades
• be in sb’s good books
• A-v node
• cardiotoxicity
• in camera
• baptizements
• clack valve
• c.
• armure
• amishes
• beastings
• Cinghalese
• (all) by oneself
• butyraldehydes