optical method of analysis
optical method of analysis
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Oblique coordinate system
orthogonal decomposition
object distance
Optical bench
operator symbol
Old quantum theory
oxygen atom
origin of agriculture
Oswald Theodore Avery
outerspace
On the Heavens
occlusal surface
ostrich egg
One divided into three
Organismus
Olbia
Oracle Bone Inscriptions
Only one earth
Ocean University of China
Organic fiber