obsessionalism
plural of rhumb line
A cation triangular molecule composed of three hydrogen atoms, or matter composed of such molecules. Symbol: H₃⁺.
(physics) A mathematical notation using indices to label the components of vectors and tensors.
obsessive behaviour
彼女の強迫的な行動のせいで、社交の場でも毎時間同じ棚を掃除してしまった。
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