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中性滤光片
met.	neutral filter
space	neutral density filter
tech.	black glass; light-balancing filter; neutral colour filter; neutral density disc; non-selective absorbent; non-selective absorber
telecom.	neutral color filter
中性［密度］滤光片
cartogr.	neutral density filter

中性滤光片: 7 phrases in 3 subjects

Chemistry	1
Remote sensing	1
Technology	5