Simply put, a delta-wing is a triangular wing planform.
简单地说，三角翼就是三角型的翼面。
Wing planform
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Wing configuration
Fixed-wing aircraft, popularly called aeroplanes, airplanes, or just planes, may be built with many wing configurations.
This page provides a breakdown of types, allowing a full description of any aircraft's wing configuration. For example the Supermarine Spitfire wing may be classified as a conventional low wing cantilever monoplane with straight elliptical wings of moderate aspect ratio and slight dihedral.