unit 21
account for
advent
amateur
appropriate
aspiring
avenue
barrier
bind
botanical 植物学的
bugle
campus
casual
chamber
civic
colony
conceal
conquer
convection
counterpart
curious
defeat
destructive
discharge
diverse
dye
elusive 难捉摸的
enroll
estimate
explode
fame
flame
folk
frustrate
genius
glue
handle
herald 先驱
hostile
illustrate
intimate
inhibit
insulate
intruder
jolt
lash
liberty
lodge
magnetic
masterpiece
metabolism 新陈代谢
minutely
morphology 形态学
navigate
normal
occasion
orchestra 管弦乐队
overlap
particle
peninsula
photograph
plastic
porpoise 海豚
precious
primal 主要的
prominent
provision
quarter
ratify
reception
regard
remind
reputation
retain
ring
rumor
scatter
secret
severe
shrimp 虾
slice
solution
spider
squeak
steam
straight
subjugation
sum
suspend
tactics
telegraph
theater
ticket
touch
transmission
tropics
unaided
utilitarian
vent
vision
wax 蜡
wit 机智
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