antibiotic: anti+bio+tic 常pl.
anticipate: foresee，look forward to,expect
antique
apartment
apparent, apparently
appeal
appetite
applaud: cheer, acclaim
applicable: from apply
applicant
appointment
appreciate: recognize
apprentice: The carpenter's apprentice built this beautiful bookcase.
approach: n. way; v. n. near
appropriate：a. suitable,becoming; vt. engross
appropriately；inappropriate
approve: pass,ratify,assent
approximate: vi. close to; adj. about
aquatic: a. marine (Most aquatic animals breathe by means of gills.)
aquarium: n.
arbitrary: a. an arbitrary decision
archaeology: n. archaeological, archaeologist
architect, architecture, architectural
arid: dry, barren
arithmetic: n.
arrange: plan, prepare
array: series
articulate: a.有关节的， vt.清楚的说
artifact---artificial: synthetic, false
artificially
artisan: workman,craftsman
artistic: aesthetical
ascending: climbing
ascribe(~ to): attribute
aspect: facet
assemble: gather, fit together assembly language
resemble
assert: affirm, declare
assign
associate: relate, consort； a.副的
associated
association
