<單字複習>
已選單詞
adjacent
astronomical
balanced
biological
central
chemical
close
cosmic
distant
domestic
durable
ecological
environmental
external
far
firm
foreign
fragile
geographical
geological
global
hard
higher
inner
internal
international
local
loose
lower
lower
middle
national
nearby
outer
peripheral
permanent
physical
regional
soft
stable
steady
surrounding
temporary
tender
tight
tough
unbalanced
universal
unstable
unsteady
upper
