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逐级变化
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1.
For
photographic
measurement
purposes
,
a
strip
of
material having
a
transparency
which
varies
in
steps
along
its
length
is
often
used
.
在
摄影
测量
中
,
经常
用
到
一种
测试
条
,
它
的
透明度
沿
长度
方向
逐级
变化
。
zài
shè yǐng
cè liáng
zhōng
,
jīng cháng
yòng
dào
yī zhǒng
cè shì
tiáo
,
tā
de
tòu míng dù
yán
cháng dù
fāng xiàng
zhú jí biàn huà
。
tr.bab.la