<單字複習>
已選單詞
advantage
age
benefit
capacity
century
cost
day
decade
density
depth
dimension
disadvantage
duration
energy
era
force
gain
height
hour
instant
length
loss
mass
minute
moment
month
period
power
pressure
price
profit
quality
second
size
strength
value
volume
weakness
week
weight
width
worth
year
