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单词
titanium dioxide
释义
titanium dioxide
Chemistry
See
titanium(IV) oxide
.
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original position
original sin
origination
origin of elements
origin of life
origin principle of taxation
Origins Program
Origins, Spectral Interpretation, Resource Identification, Security-Regolith Explorer
O-ring
Orion
Orion Arm
Orion Association
Orionid meteors
Orion Molecular Clouds
Orion Nebula
Orion spacecraft
Orion Spur
Orion variable
Oriskanyan
Orlando, Vittorio Emanuele (1860–1952)
Orléans, Duc d’
ORM
ornithine
ornithine cycle
Ornithischia
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