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观察镜 guānchájìng
plast. inspection glass; inspection window
space sight glass
tech. eyeglass; observation mirror; sight mirror
观察 镜
: 59 phrases in 13 subjects
Advertising1
Animal husbandry1
Electronics2
Engineering geology1
Explosives and Explosive Ordnance Disposal1
General7
Metallurgy19
Oil / petroleum2
Remote sensing1
Shooting sport3
Space2
Technology18
United Nations1

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