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Rotations
[ro'teʃən]
例句/造句/用法:
The
gyroscopes
in
this
,
moved
by
a
gasoline
engine
, revolved
in
a
vacuum
at
a
speed
of
three
thousand
rotations
a
minute
.
佚名.
神奇的知識之書
.
編輯:兰尼
