unit 8
abstract
acronym 首字母缩略词
agitation
ancestor
arctic
astronomy
background
beacon 灯塔
blast
breakdown
burrow
capable
cease
chill
clip
commute
cone 圆锥体
constituent
coordinate
critical
daring
delta
dictate
disseminate
down 绒毛
ecology
emphasize
enzyme 酶
excavate
extinct
federal
flee
foster
furnish
geometric
graze
harmonious
hierarchy
hydrogen
impact
indispensable
innovation
interfere
ion 离子
kernel 核
layout
linear
lubrication
mandate
medicine
midair