Displacement is a vector quantity which expesses the length and direction of a straight line from one place to another as opposed to the scalar quantity distance which expresses only the length. The SI unit for either distance or displacement is the meter
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... place of articulation of English alveolars like t, but with the tongue curled back) (t, th, d, dh, n)
Dental (tongue against teeth, like Spanish) (t, th, d, dh, ...