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parallels 音标拼音: [p'ɛrəl ,ɛlz] 垫铁 垫铁 Parallel \ Par" al* lel\, a. [ F. parall[` e] le, L. parallelus, fr. Gr. ?; para` beside ? of one another, fr. ? other, akin to L. alius. See { Alien}.] 1. ( Geom.) Extended in the same direction, and in all parts equally distant; as, parallel lines; parallel planes. [ 1913 Webster] Revolutions . . . parallel to the equinoctial. -- Hakluyt. [ 1913 Webster] Note: Curved lines or curved planes are said to be parallel when they are in all parts equally distant. [ 1913 Webster] 2. Having the same direction or tendency; running side by side; being in accordance ( with); tending to the same result; -- used with to and with. [ 1913 Webster] When honor runs parallel with the laws of God and our country, it can not be too much cherished. -- Addison. [ 1913 Webster] 3. Continuing a resemblance through many particulars; applicable in all essential parts; like; similar; as, a parallel case; a parallel passage. -- Addison. [ 1913 Webster] { Parallel bar}. ( a) ( Steam Eng.) A rod in a parallel motion which is parallel with the working beam. ( b) One of a pair of bars raised about five feet above the floor or ground, and parallel to each other, -- used for gymnastic exercises. { Parallel circles of a sphere}, those circles of the sphere whose planes are parallel to each other. { Parallel columns}, or { Parallels} ( Printing), two or more passages of reading matter printed side by side, for the purpose of emphasizing the similarity or discrepancy between them. { Parallel forces} ( Mech.), forces which act in directions parallel to each other. { Parallel motion}. ( a) ( Mach.) A jointed system of links, rods, or bars, by which the motion of a reciprocating piece, as a piston rod, may be guided, either approximately or exactly in a straight line. -- Rankine. ( b) ( Mus.) The ascending or descending of two or more parts at fixed intervals, as thirds or sixths. { Parallel rod} ( Locomotive Eng.), a metal rod that connects the crank pins of two or more driving wheels; -- called also { couping rod}, in distinction from the connecting rod. See Illust. of { Locomotive}, in App. -- { Parallel ruler}, an instrument for drawing parallel lines, so constructed as to have the successive positions of the ruling edge parallel to each other; also, one consisting of two movable parts, the opposite edges of which are always parallel. { Parallel sailing} ( Naut.), sailing on a parallel of latitude. { Parallel sphere} ( Astron. & Geog.), that position of the sphere in which the circles of daily motion are parallel to the horizon, as to an observer at either pole. { Parallel vise}, a vise having jaws so guided as to remain parallel in all positions. [ 1913 Webster]
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