单词	circle
释义	circle A closed curve every point on which is a fixed distance (the radius ) from a point (the centre ) within the curve (see illustration). The diameter is a line that joins two points on the circumference and passes through the centre: the diameter is twice the radius (r). The circumference of a circle is equal to 2πr; the area is πr2, where π is a constant with the value 3.141592. In analytical geometry the equation of a circle, centred at the origin, is x2 + y2 = r2. A circle
随便看	density density of states depleted depletion layer depolarization depression of freezing point depth of field derivative derived unit desorption detailed balance detector deuterated compound deuterium deuterium oxide deuteron deviation devil's staircase dew dew point dew-point hygrometer Dewar flask Dewar, Sir James dextrorotatory diamagnetism

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