fluctuate
verb
ˈflʌktʃueɪt
verb
1
if
a
price
or
amount
fluctuates,
it
keeps
changing
and
becoming
higher
and
lower
〔价格或数量〕波动，上下变动，起伏;
[+
between
]
Prices
were
volatile,
fluctuating
between
$20
and
$40.
价格不稳定，在 20 至 40 美元之间波动。
[+
around
]
The
number
of
children
in
the
school
fluctuates
around
100.
该校的学童人数在 100 左右波动。
Insect
populations
fluctuate
wil
dly
from
year
to
year.
昆虫的数量每年变化很大。