cutoff angle of a luminaire灯具: lamps and lanterns遮光: irising; dodging; diaphragma ...角: role; part; character遮光角: cut off angle; cutoff angle; shielding angle灯具遮蔽角: shielding angle of a luminaire下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:灯具遮光角，即可在微信中查询翻译
